# CVE-2021-26371: Information disclosure in 1st Gen AMD EPYC™ Processors

> A malicious application can exploit a bootloader flaw to expose ASP memory to userspace, leading to information disclosure on affected AMD processors.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **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:** 9 May 2023
- **Updated:** 28 Jan 2025
- **Also known as:** GHSA-283q-cf8c-x432

## What is CVE-2021-26371?

CVE-2021-26371 is a medium-severity vulnerability in Amd Epyc 7232p Firmware, published on 9 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A compromised or malicious ABL or UApp could
send a SHA256 system call to the bootloader, which may result in exposure of
ASP memory to userspace, potentially leading to information disclosure.

## Which versions are affected by CVE-2021-26371?

It affects 128 products.


Products: Amd Amd 3015ce Firmware, Amd Amd 3015e Firmware, Amd Epyc 7001 Firmware, Amd Epyc 7002 Firmware, Amd Epyc 7003 Firmware, Amd Epyc 7232p Firmware, Amd Epyc 7251 Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7261 Firmware, Amd Epyc 7262 Firmware, Amd Epyc 7272 Firmware, Amd Epyc 7281 Firmware, Amd Epyc 7282 Firmware, Amd Epyc 72f3 Firmware, Amd Epyc 7301 Firmware, Amd Epyc 7302 Firmware, Amd Epyc 7302p Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware and 108 more.

## How do I fix CVE-2021-26371?

No fix has been published for CVE-2021-26371 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26371 being exploited?

There is no known exploitation of CVE-2021-26371 in the wild and no public exploit code.

## Other vulnerabilities in Amd Epyc 7232p Firmware

- [CVE-2021-26365](https://insights.sbomify.com/CVE-2021-26365/): Information disclosure in Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock” (high 8.2)
- [CVE-2020-12930](https://insights.sbomify.com/CVE-2020-12930/): Privilege escalation in AMD Radeon RX 5000 Series & PRO W5000 Series (high 7.8)
- [CVE-2020-12931](https://insights.sbomify.com/CVE-2020-12931/): Privilege escalation in AMD Radeon RX 5000 Series & PRO W5000 Series (high 7.8)
- [CVE-2021-26392](https://insights.sbomify.com/CVE-2021-26392/): Memory corruption in AMD Radeon RX 5000 Series & PRO W5000 Series (high 7.8)
- [CVE-2021-26354](https://insights.sbomify.com/CVE-2021-26354/): Memory corruption in 2nd Gen AMD EPYC™ Processors (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26371 and fix it if it is affected.

What it is: CVE-2021-26371 is a medium-severity vulnerability in Amd Epyc 7232p Firmware, published on 9 May 2023. 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-2021-26371 in the wild and no public exploit code.

Affected product: Amd Epyc 7232p 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-2021-26371/ (Markdown: https://insights.sbomify.com/CVE-2021-26371/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26371
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26371
- OSV: https://osv.dev/vulnerability/CVE-2021-26371

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26371/
Summaries are generated and may contain mistakes; the official description above is the record.