VulnHub

Real-time Cybersecurity News

Critical

MZ Automation GmbH libiec61850

All CISA Advisories
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.

Read Original Article

Related Coverage

AnonyMousKIT PhaaS uses voice AI agents to phish iPhone passcodes

BleepingComputer

A new phishing-as-a-service platform named AnonyMousKIT has been discovered, which automates the process of stealing passcodes from iPhones. This service utilizes voice AI agents to trick users into providing their unlock codes, specifically targeting those who have had their Apple devices stolen. Once attackers obtain the passcodes, they can disable the Activation Lock, allowing them to access and potentially resell the stolen devices. This poses a significant risk to iPhone users, as it could lead to increased theft and exploitation of stolen devices. Users are urged to remain vigilant and skeptical of unsolicited calls requesting sensitive information.

Aug 25, 2026

Arrested man allegedly impersonated NSA elite hacking unit, Supreme Court chief justice

CyberScoop

Joshua Culver, also known as 'Maverick Young,' has been arrested for allegedly impersonating a high-ranking official from the NSA's Tailored Access Operations unit, which is known for its elite hacking capabilities. This incident reportedly took place during a period when the unit was not publicly referred to by that name, raising concerns about the potential for misuse of sensitive information and authority. Culver is also accused of impersonating the Chief Justice of the Supreme Court. This type of impersonation can have serious implications for national security and the integrity of government institutions, as it can undermine trust in official communications. Law enforcement continues to investigate the full extent of Culver's actions and any potential victims affected by his impersonations.

Aug 25, 2026

U.S. Sanctions Iran-Linked Hackers Behind Critical Infrastructure Breaches

The Hacker News

The U.S. Department of the Treasury has imposed new sanctions on Iranian hackers linked to breaches of critical infrastructure. This move is part of a broader strategy to cut off Iran's financial resources and disrupt its cyber operations. The sanctions target individuals and entities believed to be involved in cyber attacks that threaten vital systems. By taking this action, the U.S. aims to hold accountable those responsible for these security breaches and to deter future cyber threats from Iran. This development is significant as it underscores the ongoing geopolitical tensions and the role of cyber warfare in international relations.

Aug 25, 2026

CISA adds Oracle WebLogic bug to its list of exploited vulnerabilities

SCM feed for Latest

The Cybersecurity and Infrastructure Security Agency (CISA) has added a newly identified vulnerability in Oracle WebLogic to its list of actively exploited security issues. This vulnerability allows attackers to gain access to core business applications within an enterprise, posing significant risks to sensitive data and operations. Organizations using Oracle WebLogic middleware need to be particularly vigilant, as this exploitation could lead to severe disruptions and data breaches. Experts recommend that affected companies prioritize patching this vulnerability to safeguard their systems. The urgency is underscored by the fact that attackers are actively exploiting this flaw.

Aug 25, 2026

Norway ’s Digital Government Infrastructure Hit by a new DDoS Attack

Security Affairs

Norway's shared government digital infrastructure faced its third distributed denial-of-service (DDoS) attack on August 24, 2023, starting at 03:38 CEST. This attack disrupted various online services that citizens, businesses, and public agencies rely on. Fortunately, officials reported no indications of data breaches or compromise during the incident. The repeated nature of these attacks raises concerns about the resilience of Norway's digital systems and their ability to withstand ongoing cyber threats. This incident highlights the need for stronger cybersecurity measures to protect essential public services.

Aug 25, 2026

Water sector passes, government sector fails attempts to spot and halt simulated CISA attack

CyberScoop

In a recent cybersecurity test, red-teamers conducted simulated attacks on both the water and government sectors to evaluate their response capabilities. The water sector successfully identified and contained the simulated threats, effectively preventing any further access. In contrast, the government sector failed to manage the attack, allowing the red-teamers to gain initial access without detection. This incident illustrates the varying levels of preparedness among critical infrastructure sectors and raises concerns about the government's ability to secure sensitive systems against potential real-world attacks. The implications of such failures could be significant, especially given the importance of both sectors in maintaining public safety and national security.

Aug 25, 2026