MZ Automation libIEC61850

View CSAF
Summary
Successful exploitation of these vulnerabilities could allow an unauthenticated network-adjacent attacker to crash critical IEC 61850 services or execute arbitrary code, disrupting or compromising protection, visibility, and control functions.
The following versions of MZ Automation libIEC61850 are affected:

libIEC61850 >=v1.0.0|<=v1.6.1





CVSS
Vendor
Equipment
Vulnerabilities




v3 8.1
MZ Automation
MZ Automation libIEC61850
Stack-based Buffer Overflow, Heap-based Buffer Overflow, Improper Handling of Syntactically Invalid Structure, NULL Pointer Dereference




Background

Critical Infrastructure Sectors: Critical Manufacturing, Energy, Transportation Systems
Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany


Vulnerabilities

Expand All +

CVE-2026-50039

The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to cause a memory corruption via a ReadRequest. View CVE Details

Affected Products
MZ Automation libIEC61850

Vendor:MZ Automation
Product Version:MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1 Product Status:known_affected


Remediations
Vendor fixMZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.https://github.com/mz-automation/l
ibiec61850

Relevant CWE: CWE-121 Stack-based Buffer Overflow

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







CVE-2026-49035

The affected product is vulnerable to a heap-based buffer overflow via a crafted MMS Initiate request. Remote code execution (RCE) has been demonstrated when ASLR is disabled; memory corruption or denial of service may occur in configurations where ASLR is enabled. View CVE Details

Affected Products
MZ Automation libIEC61850

Vendor:MZ Automation
Product Version:MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1 Product Status:known_affected


Remediations
Vendor fixMZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.https://github.com/mz-automation/l
ibiec61850

Relevant CWE: CWE-122 Heap-based Buffer Overflow

Metrics




CVSS Version
Base Score
Base Severity
Vector String




3.1
8.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H


4.0
9.2
CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N







CVE-2026-50103

A NULL pointer dereference in the L2 GOOSE and R-GOOSE shared parser, which may allow a network-adjacent attacker to crash a subscribing application by sending a crafted GOOSE frame containing a malformed TLV value. View CVE Details

Affected Products
MZ Automation libIEC61850

Vendor:MZ Automation
Product Version:MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1 Product Status:known_affected


Remediations
Vendor fixMZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.https://github.com/mz-automation/l
ibiec61850

Relevant CWE: CWE-228 Improper Handling of Syntactically Invalid Structure

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-2026-50032

A NULL pointer dereference in the MMS Write Named Variable List handler, which may allow a network adjacent attacker to crash the server by sending a WriteRequest with an empty listOfData field. View CVE Details

Affected Products
MZ Automation libIEC61850

Vendor:MZ Automation
Product Version:MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1 Product Status:known_affected


Remediations
Vendor fixMZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.https://github.com/mz-automation/l
ibiec61850

Relevant CWE: CWE-476 NULL Pointer Dereference

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

Abhinav Agarwal 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: 2026-07-23




Date
Revision
Summary




2026-07-23
1
Initial Publication




Legal Notice and Terms of Use

https://www.cisa.gov/news-events/ics-advisories/icsa-26-204-06

2026-07-23 12:00 UTC

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