# CVE-2026-75944 — Arista Networks EOS

> As of 2026-09-14, CVE-2026-75944 is a LOW-severity vulnerability in Arista Networks EOS, CVSS v3.1 2.6, EPSS 0.1% (4.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-75944 as of 2026-09-14; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-14

## What is CVE-2026-75944?

A race condition during supplicant re-authentication may leave a stale ACL entry that persists in the system. If the AclAgent subsequently restarts, this stale entry may be applied to new supplicants, resulting in incorrect access control enforcement. User interaction (an AclAgent restart by an administrator) is required for the unintended behavior to take effect.

The record classifies CVE-2026-75944 under weakness class [CWE-459](https://intel.threadlinqs.com/cwe/CWE-459). Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 21 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 2.6 — LOW (`CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **CVSS v4.0 base score:** 5.6 (`CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 4.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 1.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-14

## Is CVE-2026-75944 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Arista Networks](https://intel.threadlinqs.com/vendors/arista-networks): EOS

## How to fix CVE-2026-75944

No vendor patch reference has been recorded for CVE-2026-75944 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-75944

No threat campaign in the Threadlinqs corpus currently references CVE-2026-75944, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-09-15.

**Other references**

- [arista.com](https://www.arista.com/en/support/advisories-notices/security-advisory/24706-security-advisory-0150)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-75944
Full detection coverage and IOCs for threats exploiting CVE-2026-75944 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp