CVE-2026-63033

MZ Automation lib60870 Out-of-bounds Read

Published Jul 30, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

MZ Automation recommends users update to version 2.4.1 when available. See MZ Automation advisory for more information:  https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mz-automation
Mz-automation lib60870
Vendors & Products Mz-automation
Mz-automation lib60870
Type Values Removed Values Added
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.
Title MZ Automation lib60870 Out-of-bounds Read
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'}

cvssV4_0

{'score': 6.9, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Jul 31, 2026, 7:23 PM
Reserved
Jul 16, 2026, 10:10 PM
Status
Deferred
Published
Jul 30, 2026, 11:16 PM
Modified
Oct 23, 2026, 10:10 PM