Critical · CVSS 9.4CVE-2026-102166

Security Advisory 0227CVE-2026-102166

Answer in brief

CVE-2026-102166 records a Critical severity (CVSS 9.4) vulnerability in Security Advisory 0227. The current sources do not mark it as known exploited. The current feed maps Arista Networks/Wi-Fi Access Point (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.4
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Arista Networks/Wi-Fi Access Point (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Arista Networks/Wi-Fi Access Pointgeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Arista Networks/Wi-Fi Access Point.
Review the reported fix. Source-reported workaround: nerdctl exec -it wifimanager -- bash [root@wifi-security-server1 /]# su - config [config]$ set config parameter Enter parameter name: upgrade_hmac_fallback_enabled Enter parameter value: 0 Enter configid: 3 (confirm: y) [config]$ set config parameter Enter parameter name: upgrade_hmac_fallback_enabled Enter parameter value: 0 Enter configid: 1 (confirm: y) [root@wifi-security-server1 /]# /etc/init.d/sserverd restart (Workaround: Disable the HMAC-based firmware verification fallback path. For cloud deployments, contact Arista TAC.)

Evidence timeline and material changes

Published upstream
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 10, 2026

Sources and claim methodology

Source referencearista.com

Upstream source description

Arista C-260 and C-250 access points ship with fleet-wide static cryptographic keys used for firmware image verification and SSLP authentication. An attacker who is able to access these keys would be able to create modified firmware that will pass verification checks. This vulnerability is specific to the C-260 and C-250 models; other access point models enforce digitally signed upgrade images with secure boot and are not affected by this issue.

Quoted source text, attributed separately from HOL analysis.

Package

Affected range

Fixed version

Arista Networks/Wi-Fi Access Pointgeneric

Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Arista Networks/Wi-Fi Access Point.

Review the reported fix. Source-reported workaround: nerdctl exec -it wifimanager -- bash [root@wifi-security-server1 /]# su - config [config]$ set config parameter Enter parameter name: upgrade_hmac_fallback_enabled Enter parameter value: 0 Enter configid: 3 (confirm: y) [config]$ set config parameter Enter parameter name: upgrade_hmac_fallback_enabled Enter parameter value: 0 Enter configid: 1 (confirm: y) [root@wifi-security-server1 /]# /etc/init.d/sserverd restart (Workaround: Disable the HMAC-based firmware verification fallback path. For cloud deployments, contact Arista TAC.)

Sources and claim methodology

Upstream source description

Quoted source text, attributed separately from HOL analysis.