---
title: "CVE-2026-7473: Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-7473/
description: "CVE-2026-7473 (Arista Extensible Operating System): Exploited in the wild (CISA KEV). On affected platforms running Arista EOS where a tunnel decapsulation…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-05
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-7473"
kev: true
cvss: 6.9
epss: 0.00649
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-7473: Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Arista Extensible Operating System. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-06-09, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-06-23 ; treat that as the outer limit, not the target.
- EPSS 0.6% , percentile 50: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 50% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- Arista Networks EOS: 4.36.0, 4.35.0 <= 4.35, 4.34.0 <= 4.34, 4.33.0 <= 4.33, 4.32.0 <= 4.32, 4.31.0 <= 4.31, <= 4.30

## Severity

- Arista CVSS 3.1: 5.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`
- Arista CVSS 4.0: 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`

## Exploitation

- CISA KEV: added 2026-06-09; federal due date 2026-06-23. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.65% probability of exploitation activity in the next 30 days; percentile 50.

## Sources

- [arista.com](https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137)
- [arista.com](https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137)
- [CVE.org record CVE-2026-7473](https://www.cve.org/CVERecord?id=CVE-2026-7473)
- [NVD entry CVE-2026-7473](https://nvd.nist.gov/vuln/detail/CVE-2026-7473)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473)

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Source page: https://erroneo.us/security/cve/CVE-2026-7473/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt