CVE-2026-66720
MZ Automation libiec61850 Out-of-bounds Read
- State
- Published
- Severity
- 7.1 High
- Published
- Jul 30, 2026
- Updated
- Jul 31, 2026
- Reserved
- Jul 27, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | icscert |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | icscert |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
libiec61850MZ Automation GmbH |
|
References
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