CVE-2026-63033

MZ Automation lib60870 Out-of-bounds Read

State: Published
Severity: 6.9 Medium
Published: Jul 30, 2026
Updated: Jul 31, 2026
Reserved: Jul 16, 2026

Description

A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N	icscert
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L	icscert

Weaknesses

CWE-125

Affected Products

Product	Versions
lib60870MZ Automation	2.4.0Affected 2.4.1Not affected

References

https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7
https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-11
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-11.json

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