SEPTEMBER 19, 2026
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Case File

CVE-2026-66720

MEDIUM · CVSS 6.5 EPSS 0.18% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-30 · Last synced 2026-08-29

CyberRota Analysis

AI-Generated

The vulnerability affects the GOOSE subscriber component, which fails to properly validate the UTC timestamp field in unauthenticated IEC 61850 GOOSE Layer-2 multicast messages. An attacker can exploit this flaw by sending a specially crafted GOOSE frame with an undersized timestamp, leading to a heap out-of-bounds read that crashes the process and causes a denial-of-service condition. Organizations utilizing IEC 61850 protocols in their network infrastructure should prioritize addressing this issue to maintain service availability and security.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-66720
Severity
MEDIUM
CVSS
6.5
EPSS
0.18%

Original NVD 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.