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Vulnerabilities CVE-2026-66720

CVE-2026-66720

Medium
Open
TLP:CLEAR

MZ Automation libiec61850 Out-of-bounds Read

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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.

Details

CVSS Score
6.5
EPSS Score
0.18%

7.1th percentile

CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jul 30, 2026
Last Modified
Jul 30, 2026
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