CVE-2026-67873

State: Published
Severity: 9.8 Critical
Published: Aug 5, 2026
Updated: Aug 6, 2026
Reserved: Jul 30, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-122 Heap-based Buffer Overflow

Affected Products

Product	Versions
n/an/a	n/aAffected

References

https://github.com/mz-automation/lib60870
https://github.com/mz-automation/lib60870/releases/tag/v2.4.0
https://github.com/mz-automation/lib60870/blob/master/user_guide.adoc
https://github.com/mz-automation/lib60870/issues/201

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