MZ Automation lib60870

Summary

Two out-of-bounds read vulnerabilities (CVE-2026-61893 and CVE-2026-63033) have been identified in MZ Automation's lib60870 version 2.4.0. Successful exploitation could lead to device crashes. These vulnerabilities affect critical infrastructure sectors like energy and water, deployed worldwide.

Full text

ICS Advisory MZ Automation lib60870 Release DateJuly 30, 2026 Alert CodeICSA-26-211-11 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could crash the device being accessed. The following versions of MZ Automation lib60870 are affected: lib60870 2.4.0 (CVE-2026-61893, CVE-2026-63033) CVSS Vendor Equipment Vulnerabilities v3 6.5 MZ Automation GmbH MZ Automation lib60870 Out-of-bounds Read Background Critical Infrastructure Sectors: Energy, Water and Wastewater, Critical Manufacturing, Chemical Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-61893 A crafted IEC 60870-5-104 I-frame with TypeID 104 (C_TS_NA_1) and an inflated object count causes TestCommand_getFromBuffer to read one byte past the end of the heap-allocated message buffer. View CVE Details Affected Products MZ Automation lib60870 Vendor:MZ Automation GmbH Product Version:MZ Automation GmbH lib60870: 2.4.0 Product Status:known_affected Remediations MitigationMZ Automation recommends users update to version 2.4.1 when available. Vendor fixSee MZ Automation advisories for more information: https://github.com/mz-automation/lib60870/security/advisories/GHSA-g3w7-x5rx-83xmhttps://github.com/mz-automation/lib60870/security/advisories/GHSA-g3w7-x5rx-83xm Relevant CWE: CWE-125 Out-of-bounds Read Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L 4.0 6.9 MEDIUM CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N CVE-2026-63033 A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer. View CVE Details Affected Products MZ Automation lib60870 Vendor:MZ Automation GmbH Product Version:MZ Automation GmbH lib60870: 2.4.0 Product Status:known_affected Remediations MitigationMZ Automation recommends users update to version 2.4.1 when available. Vendor fixSee MZ Automation advisory for more information: https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7 https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7 Relevant CWE: CWE-125 Out-of-bounds Read Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L 4.0 6.9 MEDIUM CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N Acknowledgments arun babu puthuparambil of Central Power Research Institute, Bengaluru, India 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. No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. Revision History Initial Release Date: 2026-07-30 Date Revision Summary 2026-07-30 1 Initial Publication Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor MZ Automation GmbH Tags Sector: Chemical Sector, Critical Manufacturing Sector, Energy 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. Related Advisories Jul 30, 2026 ICS Advisory | ICSA-26-211-04 Schneider Electric IGSS Jul 30, 2026 ICS Advisory | ICSA-26-211-02 Johnson Controls OpenBlue Employee Jul 30, 2026 ICS Advisory | ICSA-26-211-01 MikroTik RouterOS Jul 30, 2026 ICS Advisory | ICSA-26-211-03 Toptech Systems RCU II+ and Multiload II+

Indicators of Compromise

• cve — CVE-2026-61893
• cve — CVE-2026-63033

Entities