# CVE-2021-26315: Code injection in 3rd Gen AMD EPYC™

> Insufficient integrity verification in AMD PSP boot ROM allows arbitrary code execution when processing encrypted firmware images.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Nov 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-4qp6-97jw-9prg

## What is CVE-2021-26315?

CVE-2021-26315 is a high-severity code injection vulnerability in Amd Epyc 72f3 Firmware, published on 16 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2021-26315?

It affects 20 products.


Products: Amd Epyc 7003 Firmware, Amd Epyc 72f3 Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware, Amd Epyc 73f3 Firmware, Amd Epyc 7413 Firmware, Amd Epyc 7443 Firmware, Amd Epyc 7443p Firmware, Amd Epyc 7453 Firmware, Amd Epyc 74f3 Firmware, Amd Epyc 7513 Firmware, Amd Epyc 7543 Firmware, Amd Epyc 7543p Firmware, Amd Epyc 75f3 Firmware, Amd Epyc 7643 Firmware, Amd Epyc 7663 Firmware, Amd Epyc 7713 Firmware, Amd Epyc 7713p Firmware, Amd Epyc 7763 Firmware.

## How do I fix CVE-2021-26315?

No fix has been published for CVE-2021-26315 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26315 being exploited?

There is no known exploitation of CVE-2021-26315 in the wild and no public exploit code.

## Other vulnerabilities in Amd Epyc 72f3 Firmware

- [CVE-2023-20530](https://insights.sbomify.com/CVE-2023-20530/): Denial of service in 3rd Gen EPYC (high 7.5)
- [CVE-2021-26343](https://insights.sbomify.com/CVE-2021-26343/): Information disclosure in 3rd Gen EPYC (medium 5.5)
- [CVE-2021-26355](https://insights.sbomify.com/CVE-2021-26355/): Denial of service in 3rd Gen EPYC (medium 5.5)
- [CVE-2021-26404](https://insights.sbomify.com/CVE-2021-26404/): Information disclosure in 3rd Gen EPYC (medium 5.5)
- [CVE-2021-26327](https://insights.sbomify.com/CVE-2021-26327/): Information disclosure in 3rd Gen AMD EPYC™ (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26315 and fix it if it is affected.

What it is: CVE-2021-26315 is a high-severity code injection vulnerability in Amd Epyc 72f3 Firmware, published on 16 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-26315 in the wild and no public exploit code.

Affected product: Amd Epyc 72f3 Firmware. 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-2021-26315/ (Markdown: https://insights.sbomify.com/CVE-2021-26315/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26315
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26315
- OSV: https://osv.dev/vulnerability/CVE-2021-26315

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-26315/
Summaries are generated and may contain mistakes; the official description above is the record.