Labcenter Proteus 9

Summary

Labcenter Electronics released a CISA advisory warning of three critical vulnerabilities (CVE-2026-42953, CVE-2026-49033, CVE-2026-42958) in Proteus 9.1_SP4_Build_42914 affecting critical infrastructure sectors. The vulnerabilities include out-of-bounds write, stack-based buffer overflow, and use-after-free flaws that could enable arbitrary code execution via local exploitation. Labcenter recommends upgrading to version 9.2 SP0, and CISA notes no known public exploitation has been reported at this time.

Full text

ICS Advisory Labcenter Proteus 9 Release DateJuly 07, 2026 Alert CodeICSA-26-188-06 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could disclose information and allow a malicious user to execute arbitrary code on affected installations. The following versions of Labcenter Proteus 9 are affected: Proteus 9.1_SP4_Build_42914 CVSS Vendor Equipment Vulnerabilities v3 7.8 Labcenter Electronics Labcenter Proteus 9 Out-of-bounds Write, Stack-based Buffer Overflow, Use After Free Background Critical Infrastructure Sectors: Communications, Critical Manufacturing, Defense Industrial Base, Energy, Healthcare and Public Health, Transportation Systems, Water and Wastewater Countries/Areas Deployed: Worldwide Company Headquarters Location: United Kingdom Vulnerabilities Expand All + CVE-2026-42953 The application contains an out-of-bounds write vulnerability that can be exploited by an attacker to cause the program to write data past the end of an allocated memory buffer. This can lead to arbitrary code execution. View CVE Details Affected Products Labcenter Proteus 9 Vendor:Labcenter Electronics Product Version:Labcenter Electronics Proteus: 9.1_SP4_Build_42914 Product Status:known_affected Remediations Vendor fixLabcenter recommends ensuring you are using the latest version (9.2 SPO) of the software. Version can be found by looking at the bottom left of the Proteus home page (Version 8 or higher) or by selecting the About ISIS or About ARES option from the Help menu. Update notifications appear in the new and information section of the home page where you can activate the download and installation directly. MitigationIf you have questions or need help please contact Labcenter or your local distributor. Relevant CWE: CWE-787 Out-of-bounds Write Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 4.0 8.4 HIGH CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-49033 The application contains a stack-based buffer overflow vulnerability that can be exploited by an attacker to execute arbitrary code. View CVE Details Affected Products Labcenter Proteus 9 Vendor:Labcenter Electronics Product Version:Labcenter Electronics Proteus: 9.1_SP4_Build_42914 Product Status:known_affected Remediations Vendor fixLabcenter recommends ensuring you are using the latest version (9.2 SPO) of the software. Version can be found by looking at the bottom left of the Proteus home page (Version 8 or higher) or by selecting the About ISIS or About ARES option from the Help menu. Update notifications appear in the new and information section of the home page where you can activate the download and installation directly. MitigationIf you have questions or need help please contact Labcenter or your local distributor. Relevant CWE: CWE-121 Stack-based Buffer Overflow Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 4.0 8.4 HIGH CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-42958 The application contains a use-after-free vulnerability that can be exploited to cause memory corruption while parsing specially crafted files. This could allow an attacker to execute arbitrary code in the context of the current process. View CVE Details Affected Products Labcenter Proteus 9 Vendor:Labcenter Electronics Product Version:Labcenter Electronics Proteus: 9.1_SP4_Build_42914 Product Status:known_affected Remediations Vendor fixLabcenter recommends ensuring you are using the latest version (9.2 SPO) of the software. Version can be found by looking at the bottom left of the Proteus home page (Version 8 or higher) or by selecting the About ISIS or About ARES option from the Help menu. Update notifications appear in the new and information section of the home page where you can activate the download and installation directly. MitigationIf you have questions or need help please contact Labcenter or your local distributor. Relevant CWE: CWE-416 Use After Free Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 4.0 8.4 HIGH CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Acknowledgments Michael Heinzl reported these vulnerabilities to CISA Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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. These vulnerabilities are not exploitable remotely. Revision History Initial Release Date: 2026-07-07 Date Revision Summary 2026-07-07 1 Initial Publication Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Tags Sector: Communications Sector, Critical Manufacturing Sector, Defense Industrial Base Sector, Energy Sector, Healthcare and Public Health Sector, Transportation Systems Sector, Water and Wastewater Systems Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. 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Indicators of Compromise

• cve — CVE-2026-42953
• cve — CVE-2026-49033
• cve — CVE-2026-42958

Entities