# CVE-2023-20526: Information disclosure in 1st Gen AMD EPYC™ Processors

> A privileged attacker with physical access can expose ASP memory contents due to insufficient input validation in the bootloader, compromising confidentiality.

- **Severity:** Low 1.9 (`CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N`)
- **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:** 2 Aug 2024
- **Also known as:** GHSA-6gv5-48rm-6999

## What is CVE-2023-20526?

CVE-2023-20526 is a low-severity 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

Insufficient input validation in the ASP Bootloader may enable a privileged attacker with physical access to expose the contents of ASP memory potentially leading to a loss of confidentiality.

## Which versions are affected by CVE-2023-20526?

It affects 73 products.


Products: Amd Epyc 7001 Firmware, Amd Epyc 7203 Firmware, Amd Epyc 7203p 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 7303 Firmware, Amd Epyc 7303p Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware and 53 more.

## How do I fix CVE-2023-20526?

Apply the vendor's patch.

## Is CVE-2023-20526 being exploited?

There is no known exploitation of CVE-2023-20526 in the wild and no public exploit code.

## Other vulnerabilities in Amd Epyc 7232p Firmware

- [CVE-2021-26340](https://insights.sbomify.com/CVE-2021-26340/): A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation (high 8.4)
- [CVE-2021-26398](https://insights.sbomify.com/CVE-2021-26398/): Memory corruption in 1st Gen EPYC (high 7.8)
- [CVE-2021-26331](https://insights.sbomify.com/CVE-2021-26331/): Code injection in 1st Gen AMD EPYC™ (high 7.8)
- [CVE-2021-26335](https://insights.sbomify.com/CVE-2021-26335/): Code injection in Athlon™ Series (high 7.8)
- [CVE-2023-20578](https://insights.sbomify.com/CVE-2023-20578/): Race condition in AMD EPYC™ 7001 Processors (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-20526 and fix it if it is affected.

What it is: CVE-2023-20526 is a low-severity 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-2023-20526 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-2023-20526/ (Markdown: https://insights.sbomify.com/CVE-2023-20526/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-20526
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-20526
- OSV: https://osv.dev/vulnerability/CVE-2023-20526

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-20526/
Summaries are generated and may contain mistakes; the official description above is the record.