# CVE-2025-8873: Arista EOS Dataplane Denial of Service via Malformed IPsec Packet

> A remote attacker can cause a denial of service for IPsec traffic on Arista EOS devices by sending a specially crafted packet.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Jun 2026
- **Updated:** 5 Jun 2026
- **Also known as:** GHSA-xhpm-f58r-37px

## What is CVE-2025-8873?

CVE-2025-8873 is a high-severity denial of service vulnerability in Arista Networks EOS, published on 4 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 with IPsec configured, a specially crafted packet can cause the dataplane to stop processing all IPsec traffic. The control plane may detect this condition, and attempt to reset the IPsec processing pipeline. After reset traffic may not resume being processed. There is no impact to non-IPsec traffic or to IPsec traffic not originating or terminating on the system. This issue was reported by an Arista customer.

Weakness: CWE-1286 (Improper Validation of Syntactic Correctness of Input)

## Which versions are affected by CVE-2025-8873?


## How do I fix CVE-2025-8873?

No fix has been published for CVE-2025-8873 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-8873 being exploited?

There is no known exploitation of CVE-2025-8873 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-8873 and fix it if it is affected.

What it is: CVE-2025-8873 is a high-severity denial of service vulnerability in Arista Networks EOS, published on 4 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-8873 in the wild and no public exploit code.

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-2025-8873/ (Markdown: https://insights.sbomify.com/CVE-2025-8873/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-8873
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-8873
- OSV: https://osv.dev/vulnerability/CVE-2025-8873

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-8873/
Summaries are generated and may contain mistakes; the official description above is the record.