# CVE-2020-7452: Memory corruption in FreeBSD

> Privileged users in a vnet jail can panic the host or execute arbitrary kernel code via incorrect pointer use in the epair module.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fm4q-8fww-vpwr

## What is CVE-2020-7452?

CVE-2020-7452 is a critical memory corruption vulnerability in Freebsd Freebsd, published on 28 Apr 2020. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

In FreeBSD 12.1-STABLE before r357490, 12.1-RELEASE before 12.1-RELEASE-p3, 11.3-STABLE before r357489, and 11.3-RELEASE before 11.3-RELEASE-p7, incorrect use of a user-controlled pointer in the epair virtual network module allowed vnet jailed privileged users to panic the host system and potentially execute arbitrary code in the kernel.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2020-7452?

It affects 1 product.


Products: Freebsd Freebsd.

## How do I fix CVE-2020-7452?

No fix has been published for CVE-2020-7452 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7452 being exploited?

There is no known exploitation of CVE-2020-7452 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-2020-7452 and fix it if it is affected.

What it is: CVE-2020-7452 is a critical memory corruption vulnerability in Freebsd Freebsd, published on 28 Apr 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-7452 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-2020-7452/ (Markdown: https://insights.sbomify.com/CVE-2020-7452/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7452
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7452
- OSV: https://osv.dev/vulnerability/CVE-2020-7452

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-7452/
Summaries are generated and may contain mistakes; the official description above is the record.