# CVE-2021-26345: Memory corruption in 2nd Gen AMD EPYC™ Processors

> A privileged attacker can tamper with APCB tokens to cause an out-of-bounds memory read, leading to a denial of service on AMD EPYC processors.

- **Severity:** Low 1.9 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Nov 2023
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-vgxm-8jf8-3h3v

## What is CVE-2021-26345?

CVE-2021-26345 is a low-severity memory corruption vulnerability in Amd Epyc 7232p Firmware, published on 14 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Failure to validate the value in APCB may allow a privileged attacker to tamper with the APCB token to force an out-of-bounds memory read potentially resulting in a denial of service.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-26345?

It affects 90 products.


Products: Amd Epyc 7203 Firmware, Amd Epyc 7203p Firmware, Amd Epyc 7232p Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7262 Firmware, Amd Epyc 7272 Firmware, Amd Epyc 7282 Firmware, Amd Epyc 72f3 Firmware, Amd Epyc 7302 Firmware, Amd Epyc 7302p Firmware, Amd Epyc 7303 Firmware, Amd Epyc 7303p Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware, Amd Epyc 7352 Firmware, Amd Epyc 7373x Firmware, Amd Epyc 73f3 Firmware, Amd Epyc 7402 Firmware, Amd Epyc 7402p Firmware and 70 more.

## How do I fix CVE-2021-26345?

Apply the vendor's patch.

## Is CVE-2021-26345 being exploited?

There is no known exploitation of CVE-2021-26345 in the wild and no public exploit code.

## Other vulnerabilities in Amd Epyc 7232p Firmware

- [CVE-2024-21980](https://insights.sbomify.com/CVE-2024-21980/): Memory corruption in 3rd Gen AMD EPYC™ Processors (high 7.9)
- [CVE-2023-20591](https://insights.sbomify.com/CVE-2023-20591/): Other in AMD EPYC™ 7003 Series Processors (medium 6.5)
- [CVE-2023-20533](https://insights.sbomify.com/CVE-2023-20533/): Denial of service in 2nd Gen AMD EPYC™ Processors (medium 6.1)
- [CVE-2023-31355](https://insights.sbomify.com/CVE-2023-31355/): Memory corruption in 3rd Gen AMD EPYC™ Processors (medium 6.0)
- [CVE-2024-21978](https://insights.sbomify.com/CVE-2024-21978/): Information disclosure in 3rd Gen AMD EPYC™ Processors (medium 6.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26345 and fix it if it is affected.

What it is: CVE-2021-26345 is a low-severity memory corruption vulnerability in Amd Epyc 7232p Firmware, published on 14 Nov 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-2021-26345 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-2021-26345/ (Markdown: https://insights.sbomify.com/CVE-2021-26345/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26345
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26345
- OSV: https://osv.dev/vulnerability/CVE-2021-26345

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-26345/
Summaries are generated and may contain mistakes; the official description above is the record.