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MZ Automation GmbH libiec61850

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PhishingCVEExploitUpdateCritical

Overview

MZ Automation GmbH's libiec61850 library, used in critical infrastructure like energy systems, has several vulnerabilities that could lead to denial-of-service attacks. Versions prior to 1.6.2 are affected by multiple issues, including improper validation of timestamps and flaws in the GOOSE and MMS message processing. Attackers could exploit these weaknesses by sending specially crafted messages, causing the affected services to crash. This poses a significant risk to operational reliability in systems relying on this library. Users are urged to update to version 1.6.2 to mitigate these risks.

Key Takeaways

  • Affected Systems: MZ Automation GmbH libiec61850 versions <1.6.2, affecting critical infrastructure in the energy sector worldwide.
  • Action Required: MZ Automation GmbH recommends that users update to version 1.
  • Timeline: Newly disclosed

Original Article Summary

View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition on the device. The following versions of MZ Automation GmbH libiec61850 are affected: libiec61850 <1.6.2 (CVE-2026-66720, CVE-2026-66369, CVE-2026-63550, CVE-2026-65421, CVE-2026-66364, CVE-2026-66349, CVE-2026-56758, CVE-2026-66360) CVSS Vendor Equipment Vulnerabilities v3 7.5 MZ Automation GmbH MZ Automation GmbH libiec61850 Out-of-bounds Read Background Critical Infrastructure Sectors: Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-66720 The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A specially crafted GOOSE frame containing an undersized timestamp field can trigger a heap out-of-bounds read during message processing, causing the process to crash and resulting in a denial-of-service condition. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. 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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 7.1 HIGH 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 CVE-2026-66369 The GOOSE parser contains an off-by-one boundary-handling flaw that can be triggered by a single unauthenticated Layer-2 multicast frame on the process bus. When specific GOOSE message fields are processed, the parser advances its internal buffer position incorrectly, resulting in a heap out-of-bounds read. On affected platforms, this condition reliably terminates the subscriber process and causes a denial-of-service. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. 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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 7.1 HIGH 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 CVE-2026-63550 The MMS BER decoder contains a boundary-handling flaw in the processing of certain fields within confirmed-request messages. When a crafted BER-encoded element is received over an established MMS session (TCP port 102), the decoder may advance its internal read position incorrectly, leading to a heap out-of-bounds read. This condition causes the MMS handling process to terminate unexpectedly, resulting in a denial-of-service. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. 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:L/UI:N/S:U/C:N/I:N/A:H 4.0 7.1 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-65421 The MMS BER decoder contains a flaw in decoding fixed-width BER fields (boolean/integer): an attacker-supplied length value is not validated, causing a read past the end of a heap buffer. This leads to termination of the MMS service process and a denial-of-service condition. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. 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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 7.1 HIGH 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 CVE-2026-66364 The GOOSE payload parser contains a boundary handling flaw that can be triggered by a single unauthenticated Layer 2 multicast frame on the process bus. When processing specific payload fields, an attacker controlled inner element length may exceed its enclosing length, causing the parser to over read by one byte. This out-of-bounds read reliably terminates the subscriber process, resulting in a denial-of-service condition. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. 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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 7.1 HIGH 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 CVE-2026-66349 The MMS server connection handler contains a flaw in its processing of BER-encoded request data. When an MMS confirmed request PDU containing an extended BER tag is received over an established session, the decoder may advance its internal buffer incorrectly due to a missing bounds check. This results in a one byte heap out-of-bounds read and causes the MMS service process to terminate, leading to a denial-of-service condition. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. 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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 6.9 MEDIUM CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-56758 The ACSE layer contains a flaw in the processing of AARQ PDUs during MMS connection establishment. When parsing certain fields within the calling AP title, an attacker controlled length value of zero or one may cause the parser to read past the end of a heap buffer. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. 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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 6.9 MEDIUM CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-66360 The ISO Presentation layer contains a flaw in the handling of specific parameters during normal mode negotiation. A missing length check in the processing of the encoded presentation data allows an attacker controlled field with a zero length value to trigger a bounded heap over read. This condition occurs before MMS session establishment, a crafted TCP/102 connection attempt can trigger the issue. The resulting over read causes the process to terminate, leading to a denial of service condition. View CVE Details Affected Products MZ Automation GmbH libiec61850 Vendor: MZ Automation GmbH Product Version: MZ Automation GmbH libiec61850: <1.6.2 Product Status: known_affected Remediations Mitigation MZ Automation GmbH recommends that users update to version 1.6.2. Relevant CWE: CWE-125 Out-of-bounds Read Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.7 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Acknowledgments Arun Babu of Central Power Research Institute 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. Revision History Initial Release Date: 2026-07-30 Date Revision Summary 2026-07-30 1 Initial Publication Legal Notice and Terms of Use

Impact

MZ Automation GmbH libiec61850 versions <1.6.2, affecting critical infrastructure in the energy sector worldwide.

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Newly disclosed

Remediation

MZ Automation GmbH recommends that users update to version 1.6.2 to address these vulnerabilities.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Phishing, CVE, Exploit, and 2 more.

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