As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemens’ ProductCERT Security Advisories (CERT Services | Services | Siemens Global).

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 8.7
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Siemens
• Equipment: SIMATIC PCS neo
• Vulnerability: Insufficient Session Expiration

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a remote unauthenticated attacker, who has obtained the session token by other means, to re-use a legitimate user’s session even after logout.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports that the following products are affected:

• SIMATIC PCS neo V4.1: All versions prior to V4.1 Update 3
• SIMATIC PCS neo V5.0: All versions prior to V5.0 Update 1

3.2 VULNERABILITY OVERVIEW

3.2.1 INSUFFICIENT SESSION EXPIRATION CWE-613

Affected products do not correctly invalidate user sessions upon user logout. This could allow a remote unauthenticated attacker, who has obtained the session token by other means, to re-use a legitimate user’s session even after logout.

CVE-2025-40566 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-40566. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported this vulnerability to CISA.

4. MITIGATIONS

Siemens has released new versions for the affected products and recommends updating to the latest versions:

• SIMATIC PCS neo V4.1: Update to V4.1 Update 3 or later version.
• SIMATIC PCS neo V5.0: Update to V5.0 Update 1 or later version.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-339086 in HTML and CSAF.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open attachments in unsolicited email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

• May 15, 2025: Initial Republication of Siemens ProductCERT SSA-339086

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 8.5
• ATTENTION: Low attack complexity
• Vendor: ABB
• Equipment: Automation Builder
• Vulnerabilities: Incorrect Permission Assignment for Critical Resource

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to overrule the Automation Builder’s user management.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Automation Builder are affected:

• Automation Builder: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE CWE-732

The affected products store all user management information in the project file. Despite the password data being fully encrypted, an attacker could try to modify parts of the Automation Builder project file by specially crafting contents so the user management will be overruled.

CVE-2025-3394 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-3394. A base score of 8.5 has been calculated; the CVSS vector string is (AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.2 INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE CWE-732

Automation Builder projects, including AC500 V2 or SM560-S devices, contain the application files for these devices. An attacker could try to modify parts of these files so the project can be changed by overruling the Automation Builder user management.

CVE-2025-3395 has been assigned to this vulnerability. A CVSS v3 base score of 7.1 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).

A CVSS v4 score has also been calculated for CVE-2025-3395. A base score of 8.4 has been calculated; the CVSS vector string is (AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Switzerland

3.4 RESEARCHER

Jiho Shin from Sungkyunkwan University reported these vulnerabilities to CISA.

4. MITIGATIONS

ABB recommends users apply the following workarounds:

For CVE-2025-3394:

• In the project settings, set “Security” to “Integrity” check.

For CVE-2025-3395:

• In the project settings, set “Security” to “Encryption.”

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. These vulnerabilities are not exploitable remotely.

5. UPDATE HISTORY

• May 13, 2025: Initial Publication

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 7.1
• ATTENTION: Low attack complexity
• Vendor: Hitachi Energy
• Equipment: Relion 670/650/SAM600-IO Series
• Vulnerability: Buffer Copy without Checking Size of Input (‘Classic Buffer Overflow’)

2. RISK EVALUATION

Successful exploitation of this vulnerability can allow an attacker to reboot the device and cause a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Hitachi Energy reports the following products are affected:

• Relion 670/650/SAM600-IO series: Versions 2.2.2.0 up to but not including 2.2.2.6
• Relion 670/650/SAM600-IO series: Versions 2.2.3.0 up to but not including 2.2.3.7
• Relion 670/650/SAM600-IO series: Versions 2.2.4.0 up to but not including 2.2.4.4
• Relion 670/650/SAM600-IO series: Versions 2.2.5.6 up to but not including 2.2.5.6
• Relion 670/650/SAM600-IO series: 2.2.0.x
• Relion 670/650/SAM600-IO series: 2.2.1.x

3.2 VULNERABILITY OVERVIEW

3.2.1 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT (‘CLASSIC BUFFER OVERFLOW’) CWE-120

A vulnerability exists in the input validation of the GOOSE messages where out of range values received and processed by the IED cause a reboot of the device. In order for an attacker to exploit the vulnerability, GOOSE receiving blocks need to be configured.

CVE-2023-4518 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2023-4518. A base score of 7.1 has been calculated; the CVSS vector string is (CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Switzerland

3.4 RESEARCHER

Hitachi Energy PSIRT reported this vulnerability to CISA.

4. MITIGATIONS

Hitachi Energy identified the following specific workarounds and mitigations users can apply to reduce risk:

• Relion 670 series Version 2.2.2.x up to but not including 2.2.2.6: Update to Version 2.2.2.6
• Relion 670 series Version 2.2.3.x up to but not including 2.2.3.7: Update to Version 2.2.3.7
• Relion 670/650 series Version 2.2.4.x up to but not including 2.2.4.4: Update to Version 2.2.4.4
• Relion 670/650/SAM600-IO series Version 2.2.5.6 up to but not including 2.2.5.6: Update to Version 2.2.5.6
• Relion 670 series Version 2.2.0 all revisions and Relion 670/650/SAM600-IO series Version 2.2.1 all revisions: Apply general mitigations.

For more information see the associated Hitachi Energy PSIRT security advisory 8DBD000170 Cybersecurity Advisory – Improper Input Validation Vulnerability in Hitachi Energy’s Relion® 670/650/SAM600-IO series Product.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open attachments in unsolicited email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

• May 13, 2025: Initial Republication of Hitachi Energy Advisory 8DBD000170

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 9.4
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Hitachi Energy
• Equipment: MACH GWS products
• Vulnerabilities: Improper Neutralization of Special Elements in Data Query Logic, Improper Limitation of a Pathname to a Restricted Directory, Authentication Bypass by Capture-replay, Missing Authentication for Critical Function

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to inject code, read or modify files, hijack user sessions, or access exposed ports without authentication.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Hitachi Energy products are affected:

• MACH GWS: Version 2.1.0.0 (CVE-2024-4872, CVE-2024-3980)
• MACH GWS: Versions 2.2.0.0 to 2.4.0.0 (CVE-2024-4872, CVE-2024-3980)
• MACH GWS: Versions 3.0.0.0 to 3.3.0.0 (CVE-2024-4872, CVE-2024-3980, CVE-2024-3982)
• MACH GWS: Versions 3.1.0.0 to 3.3.0.0 (CVE-2024-7940)

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS IN DATA QUERY LOGIC CWE-943

A vulnerability exists in the query validation of the MACH GWS product. If exploited this could allow an authenticated attacker to inject code towards persistent data. Note that to successfully exploit this vulnerability an attacker must have a valid credential.

CVE-2024-4872 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.9 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-4872. A base score of 9.0 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.2.2 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY (‘PATH TRAVERSAL’) CWE-22

The MACH GWS product allows an authenticated user input to control or influence paths or file names that are used in filesystem operations. If exploited the vulnerability allows the attacker to access or modify system files or other files that are critical to the application.

CVE-2024-3980 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.9 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-3980. A base score of 9.4 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.2.3 AUTHENTICATION BYPASS BY CAPTURE-REPLAY CWE-294

An attacker with local access to machine where MACH GWS is installed, could enable the session logging supporting the product and try to exploit a session hijacking of an already established session.

Note: By default, the session logging level is not enabled and only users with administrator rights can enable it.

CVE-2024-3982 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.2 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-3982. A base score of 7.3 has been calculated; the CVSS vector string is (AV:L/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.2.4 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306

The MACH GWS product exposes a service that is intended for local only to all network interfaces without any authentication.

CVE-2024-7940 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.3 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-7940. A base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.3 PRODUCT IMPACT

Additional product-specific impact for MACH GWS 2 affected product vulnerable to the CVE:

• CVE-2024-4872
• (Hitachi Energy MACH GWS 2): A CVSS v3.1 base score of 8.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
• (Hitachi Energy MACH GWS 2) A CVSS v4.0 base score of 9.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).
• CVE-2024-3980
• (Hitachi Energy MACH GWS 2): A CVSS v3.1 base score of 8.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
• (Hitachi Energy MACH GWS 2) A CVSS v4.0 base score of 9.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.4 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Switzerland

3.5 RESEARCHER

Hitachi Energy reported these vulnerabilities to CISA.

4. MITIGATIONS

Hitachi Energy recommends that users update to the new versions listed below:

• MACH GWS Versions 3.0.0.0 to 3.3.0.0: Upgrade to version 3.4.0.0.
• MACH GWS Version 2.1.0.0: Apply the patch HF1 to HF6 sequentially.
• MACH GWS Versions 2.2.0.0 to 2.4.0.0: Apply the patch HF3 to HF6 sequentially.

For more information, visit the Hitachi Energy security advisory.

Hitachi Energy recommended security practices and firewall configurations can help protect a process control network from attacks originating outside the network. Such practices include ensuring that process control systems are physically protected from direct access by unauthorized personnel, have no direct connections to the Internet, and are separated from other networks by a firewall system with a minimal number of exposed ports, evaluated on a case-by-case basis. Process control systems should not be used for Internet surfing, instant messaging, or receiving emails. Portable computers and removable storage media should be carefully scanned for viruses before being connected to a control system. Proper password policies and processes should be followed.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open attachments in unsolicited email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.

5. UPDATE HISTORY

• May 13, 2025: Initial Republication of Hitachi Energy Advisory 8DBD000211

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 9.3
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Pixmeo
• Equipment: OsiriX MD
• Vulnerabilities: Use After Free, Cleartext Transmission of Sensitive Information

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to cause memory corruption, resulting in a denial-of-service condition or to steal credentials.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Pixmeo products are affected:

• OsiriX MD: Versions 14.0.1 (Build 2024-02-28) and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 USE AFTER FREE CWE-416

The affected product is vulnerable to a use after free scenario, which could allow an attacker to upload a crafted DICOM file and cause memory corruption leading to a denial-of-service condition.

CVE-2025-27578 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2025-27578. A base score of 8.7 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.2 USE AFTER FREE CWE-416

The affected product is vulnerable to a local use after free scenario, which could allow an attacker to locally import a crafted DICOM file and cause memory corruption or a system crash.

CVE-2025-31946 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.2 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2025-31946. A base score of 6.9 has been calculated; the CVSS vector string is (AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.3 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319

The Osirix MD Web Portal sends credential information without encryption, which could allow an attacker to steal credentials.

CVE-2025-27720 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.4 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

A CVSS v4 score has also been calculated for CVE-2025-27720. A base score of 9.3 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Switzerland

3.4 RESEARCHER

Chizuru Toyama of TXOne Networks and Canaan Kao of TXOne Networks reported these vulnerabilities to CISA.

4. MITIGATIONS

Pixmeo recommends users to download the latest version of OsiriX MD.

For additional support regarding OsiriX MD, users should contact Pixmeo directly.

CISA recommends users take defensive measures to minimize the risk of exploitation of this these vulnerabilities, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open attachments in unsolicited email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.

5. UPDATE HISTORY

• May 8, 2025: Initial Publication

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 9.3
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Johnson Controls Inc.
• Equipment: ICU
• Vulnerability: Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of this vulnerability may allow an attacker to execute arbitrary code.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Johnson Controls reports the following versions of ICU are affected:

• ICU: Versions prior to 6.9.5

3.2 VULNERABILITY OVERVIEW

3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121

Under certain circumstances, the ICU tool can have a buffer overflow issue.

CVE-2025-26382 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2025-26382. A base score of 9.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Commercial Facilities, Government Services and Facilities, Transportation Systems, Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Ireland

3.4 RESEARCHER

Reid Wightman of Dragos reported this vulnerability to Johnson Controls, Inc.

4. MITIGATIONS

Johnson Controls recommends users upgrade ICU to Version 6.9.5.

For more detailed mitigation instructions, please see Johnson Controls Product Security Advisory JCI-PSA-2025-04.

Aligning with CISA recommendations, Johnson Controls recommends taking steps to minimize risks to all building automation systems.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more secure methods, such as virtual private networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

• April 24, 2025: Initial Republication of Johnson Controls JCI-PSA-2025-04