# CVE-2021-29632: Memory corruption in FreeBSD

> A memory corruption vulnerability in the FreeBSD console allows attackers to overwrite kernel memory, potentially leading to code execution or privilege escalation.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jan 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-hvhc-gqfx-h3hx

## What is CVE-2021-29632?

CVE-2021-29632 is a high-severity memory corruption vulnerability in Freebsd Freebsd, published on 18 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In FreeBSD 13.0-STABLE before n247428-9352de39c3dc, 12.2-STABLE before r370674, 13.0-RELEASE before p6, and 12.2-RELEASE before p12, certain conditions involving use of the highlight buffer while text is scrolling on the console, console data may overwrite data structures associated with the system console or other kernel memory.

## Which versions are affected by CVE-2021-29632?

It affects 1 product.


Products: Freebsd Freebsd.

## How do I fix CVE-2021-29632?

No fix has been published for CVE-2021-29632 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-29632 being exploited?

There is no known exploitation of CVE-2021-29632 in the wild and no public exploit code.

## Other vulnerabilities in Freebsd Freebsd

- [CVE-2018-17160](https://insights.sbomify.com/CVE-2018-17160/): Memory corruption in FreeBSD (critical 10.0)
- [CVE-2014-3954](https://insights.sbomify.com/CVE-2014-3954/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-4304](https://insights.sbomify.com/CVE-2006-4304/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-0226](https://insights.sbomify.com/CVE-2006-0226/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0002](https://insights.sbomify.com/CVE-2004-0002/): Denial of service in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-29632 and fix it if it is affected.

What it is: CVE-2021-29632 is a high-severity memory corruption vulnerability in Freebsd Freebsd, published on 18 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-29632 in the wild and no public exploit code.

Affected product: Freebsd Freebsd. 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-2021-29632/ (Markdown: https://insights.sbomify.com/CVE-2021-29632/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-29632
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-29632
- OSV: https://osv.dev/vulnerability/CVE-2021-29632

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-29632/
Summaries are generated and may contain mistakes; the official description above is the record.