# CVE-2026-7473 — Arista Networks EOS

**CISA KEV**

> As of 2026-10-07, CVE-2026-7473 is a MEDIUM-severity vulnerability in Arista Networks EOS, CVSS v3.1 5.8, EPSS 0.6% (49.5th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-09), with a US federal remediation deadline of 2026-06-23. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-7473, most recently “CVE-2026-7473: Arista EOS Tunnel Decapsulation Protocol-Confusion Bypass — No Vendor Patch, Actively Exploited”.

**Last updated:** 2026-10-07

## What is CVE-2026-7473?

On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic. This issue has been reported as being exploited in the wild.

The record classifies CVE-2026-7473 under weakness class [CWE-1023](https://cwe.mitre.org/data/definitions/1023.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 145 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.8 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`)
- **CVSS v4.0 base score:** 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N`)
- **EPSS (FIRST):** 0.6% probability of exploitation in the next 30 days, higher than 49.5% of all scored CVEs
- **CISA KEV:** Listed since 2026-06-09, federal remediation deadline 2026-06-23
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2026-06-05, last modified 2026-10-07

## Is CVE-2026-7473 being exploited?

CISA added CVE-2026-7473 to the Known Exploited Vulnerabilities catalog on 2026-06-09, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-06-23 under BOD 22-01. Weaponised exploit code for CVE-2026-7473 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

- [fevar54/CVE-2026-7473---Arista-EOS-Tunnel-Decapsulation-Bypass](https://github.com/fevar54/CVE-2026-7473---Arista-EOS-Tunnel-Decapsulation-Bypass) (github)

## Affected products and versions

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

## How to fix CVE-2026-7473

Vendor advisory: [https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137](https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137). Because CVE-2026-7473 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-06-23. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-7473

1 tracked threat in the Threadlinqs corpus references CVE-2026-7473, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-7473: Arista EOS Tunnel Decapsulation Protocol-Confusion Bypass — No Vendor Patch, Actively Exploited](https://intel.threadlinqs.com/threat/TL-2026-1493) — CRITICAL · 2026-06-16

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [arista.com — vendor advisory](https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-7473
Full detection coverage and IOCs for threats exploiting CVE-2026-7473 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp