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CVE-2026-66720 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.1 HIGHVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json	[email protected]	AdvisoryBundleRemedy
https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10	[email protected]	AdvisoryBundleRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	[email protected]

Affected Products

Product	Versions
MZ Automation GmbH libiec61850	< 1.6.2 (semver)
CPE cpe:2.3:a:mz-automation:libiec61850:::::::: cpe:2.3:a:mzautomation:libiec61850:::::::: Remediation Upgrade: 1.6.2moderate effort Mitigation:low effort Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs).

Product

Versions

MZ Automation GmbH libiec61850

< 1.6.2 (semver)

CPE

cpe:2.3:a:mz-automation:libiec61850:*:*:*:*:*:*:*:*
cpe:2.3:a:mzautomation:libiec61850:*:*:*:*:*:*:*:*

Remediation

Upgrade: 1.6.2moderate effort
Mitigation:low effort
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs).

Change History

2 change records found show changes

Date	Action	Recorded By
Jul 31, 2026	CVE Modified	CISA-ADP
Jul 30, 2026	New CVE Received	[email protected]