CVE-2026-66720
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A specially crafted GOOSE frame containing an undersized timestamp field can trigger a heap out-of-bounds read during message processing, causing the process to crash and resulting in a denial-of-service condition.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MZ Automation GmbH | libiec61850 | 0 < 1.6.2 | affected |
| MZ Automation GmbH | libiec61850 | 1.6.2 | unaffected |
Weaknesses
- CWE-125: CWE-125
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json
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