Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-21
- https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-11
- https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j
FAQ
What is CVE-2026-63033?
CVE-2026-63033 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 me...
How severe is CVE-2026-63033?
CVE-2026-63033 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63033?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.