# CVE-2021-43310: Auth bypass in keylime

> An attacker can reset agent keys via crafted requests, leading to remote code execution in Keylime deployments.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Sep 2022
- **Updated:** 27 May 2025
- **Also known as:** GHSA-2m39-75g9-ff5r

## What is CVE-2021-43310?

CVE-2021-43310 is a critical authentication bypass vulnerability in keylime, published on 21 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in Keylime before 6.3.0 allows an attacker to craft a request to the agent that resets the U and V keys as if the agent were being re-added to a verifier. This could lead to a remote code execution.

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2021-43310?

It affects 1 product.


Products: Keylime Keylime.

## How do I fix CVE-2021-43310?

No fix has been published for CVE-2021-43310 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43310 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-43310 exists.

## Other vulnerabilities in keylime

- [CVE-2026-1709](https://insights.sbomify.com/CVE-2026-1709/): Keylime Missing Authentication for Critical Function and Improper Authentication (critical 9.4)
- [CVE-2022-23948](https://insights.sbomify.com/CVE-2022-23948/): Information disclosure in keylime (high 7.5)
- [CVE-2022-23949](https://insights.sbomify.com/CVE-2022-23949/): Other in keylime (high 7.5)
- [CVE-2022-23950](https://insights.sbomify.com/CVE-2022-23950/): Denial of service in keylime (high 7.5)
- [CVE-2022-23952](https://insights.sbomify.com/CVE-2022-23952/): Information disclosure in keylime (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43310 and fix it if it is affected.

What it is: CVE-2021-43310 is a critical authentication bypass vulnerability in keylime, published on 21 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-43310 exists.

Affected product: keylime. 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-2021-43310/ (Markdown: https://insights.sbomify.com/CVE-2021-43310/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43310
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43310
- OSV: https://osv.dev/vulnerability/CVE-2021-43310

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43310/
Summaries are generated and may contain mistakes; the official description above is the record.