CVE-2026-63033 Details
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.
A vulnerability exists in MZ Automation lib60870 version 2.4.0, where a crafted IEC 60870-5-104 I-frame can cause a heap-based out-of-bounds read. This occurs when the declared object count exceeds the capacity of the ASDU body, leading the parser to read beyond the allocated buffer. The issue was introduced because the parsing function does not validate the message size before processing, allowing exploitation through specially crafted input.
Users are advised to update to version 2.4.1 of MZ Automation lib60870, which addresses the vulnerability by adding the necessary bounds-checking in the parsing function.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 30, 2026CISA-ADP
Assessed Jul 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-11.json | [email protected] | AdvisoryBundleRemedy |
| https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7 | [email protected] | AdvisoryExploitRemedyVendor |
| https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-11 | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| MZ Automation lib60870 | 2.4.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 31, 2026 | CVE Modified | CISA-ADP |
| Jul 30, 2026 | New CVE Received | [email protected] |