CVE-2026-66720Disclosure

LOWCVSS 7.1 · HIGH

Signal is active with 3 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

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.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

3 mentions across 1 observed day

What's happening

Technical details provided in 3 signals
Disclosure: 3 classified signals
3 total mentions across 1 day

Deep dive

Activity timeline3 mentions / 1d

Signal classification1 categories

Disclosure

3100.0%

Referenced assets3 URLs

By indicator

Full discourse3 posts

CVE@CVEnew91d
Disclosure
CVE-2026-66720 The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A spec… https://www.cve.org/CVERecord?id=CVE-2026-66720
Post summary
A new CVE (CVE-2026-66720) has been announced, detailing an improper UTC timestamp validation in IEC 61850 GOOSE Layer‑2 messages, but no PoC, exploit, active exploitation, or patch is currently mentioned.
000101.2K
57.9K followersView on X
BREACHSPIDER@breachspider91d
Disclosure
[Threat Brief] MZ Automation libiec61850 Multiple DoS Flaws (CVE-2026-66720 and Related) Threaten IEC 61850 Substation Communications https://breachspider.com/intel/2026-07-31-mz-automation-libiec61850-multiple-dos-flaws-cve-2026-66720 #ICS #OTSecurity #SCADA #CriticalInfrastructure
Post summary
The brief announces newly identified DoS vulnerabilities in MZ Automation’s libiec61850 that threaten IEC 61850 substation communications, but provides no PoC, exploit code, or patch details.
0000066
2.3K followersView on X
Infoflowcloud@infoflowcloud91d
Disclosure
🚨*CVE* CVE-2026-66720 The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A spec… https://www.cve.org/CVERecord?id=CVE-2026-66720 ----- Traducción: CVE-2026-66720 El … http://infoflow.cloud`
Post summary
The tweet announces CVE-2026-66720 with a brief technical description of a timestamp validation flaw in IEC 61850 GOOSE subscribers; no exploit details or mitigation steps are provided.
0000037
96 followersView on X

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