Vulnerability Description
A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegment_encode() validates only the standalone segment length via FileSegment_GetMaxDataSize() and does not verify the residual capacity of the current ASDU frame before encoding object fields and segment data
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/mz-automation/lib60870
- https://github.com/mz-automation/lib60870/blob/master/user_guide.adoc
- https://github.com/mz-automation/lib60870/issues/201
- https://github.com/mz-automation/lib60870/releases/tag/v2.4.0
- https://github.com/mz-automation/lib60870/issues/201
FAQ
What is CVE-2026-67873?
CVE-2026-67873 is a vulnerability with a CVSS score of 9.8 (CRITICAL). A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegment_encode() validates only the standalone segment length vi...
How severe is CVE-2026-67873?
CVE-2026-67873 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-67873?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.