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

> Attackers can bypass tunnel decapsulation controls on Arista EOS switches by sending unexpected tunnel protocols, leading to unauthorized packet forwarding.

- **Severity:** Medium 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`)
- **Exploited in the wild:** Yes, since 9 Jun 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Jun 2026
- **Updated:** 7 Oct 2026
- **Also known as:** GHSA-mcx4-vm6v-r473

## What is CVE-2026-7473?

CVE-2026-7473 is a medium-severity vulnerability in Arista Networks EOS, published on 5 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-1023 (Incomplete Comparison with Missing Factors)

## Which versions are affected by CVE-2026-7473?

It affects 1 product.


Products: Arista Eos.

## How do I fix CVE-2026-7473?

No fix has been published for CVE-2026-7473 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 23 Jun 2026.

## Is CVE-2026-7473 being exploited?

Yes. Attackers have exploited CVE-2026-7473 in the wild since at least 9 Jun 2026.

Public exploit code:

- PoC de CVE-2026-7473: bypass de decapsulacion de tunel en Arista EOS. (github_poc): https://github.com/fevar54/CVE-2026-7473---Arista-EOS-Tunnel-Decapsulation-Bypass

## Other vulnerabilities in Arista Networks EOS

- [CVE-2015-8236](https://insights.sbomify.com/CVE-2015-8236/): Privilege escalation in n/a (critical 10.0)
- [CVE-2020-10188](https://insights.sbomify.com/CVE-2020-10188/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-18017](https://insights.sbomify.com/CVE-2017-18017/): Use after free in n/a (critical 9.8)
- [CVE-2017-14491](https://insights.sbomify.com/CVE-2017-14491/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-24509](https://insights.sbomify.com/CVE-2023-24509/): Privilege escalation in Arista EOS (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7473 and fix it if it is affected.

What it is: CVE-2026-7473 is a medium-severity vulnerability in Arista Networks EOS, published on 5 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-7473 in the wild since at least 9 Jun 2026.

Affected product: Arista Networks EOS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-7473/ (Markdown: https://insights.sbomify.com/CVE-2026-7473/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7473
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7473
- OSV: https://osv.dev/vulnerability/CVE-2026-7473

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7473/
Summaries are generated and may contain mistakes; the official description above is the record.