Vulnerability Description
The GOOSE payload parser contains a boundary handling flaw that can be triggered by a single unauthenticated Layer 2 multicast frame on the process bus. When processing specific payload fields, an attacker controlled inner element length may exceed its enclosing length, causing the parser to over read by one byte. This out-of-bounds read reliably terminates the subscriber process, resulting in a denial-of-service condition.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-21
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10
FAQ
What is CVE-2026-66364?
CVE-2026-66364 is a vulnerability with a CVSS score of 6.5 (MEDIUM). The GOOSE payload parser contains a boundary handling flaw that can be triggered by a single unauthenticated Layer 2 multicast frame on the process bus. When processing specific payload fields, an a...
How severe is CVE-2026-66364?
CVE-2026-66364 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-2026-66364?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.