# CVE-2021-22982: Memory corruption in BIG-IP DNS and GTM

> A buffer overflow in big3d allows attackers to execute arbitrary code or cause denial of service on BIG-IP DNS and GTM systems.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/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:** 12 Feb 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-3g9m-2rxr-22r8

## What is CVE-2021-22982?

CVE-2021-22982 is a high-severity memory corruption vulnerability in F5 Big-Ip Domain Name System, published on 12 Feb 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

On BIG-IP DNS and GTM version 13.1.x before 13.1.0.4, and all versions of 12.1.x and 11.6.x, big3d does not securely handle and parse certain payloads resulting in a buffer overflow. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2021-22982?

It affects 2 products.


Products: F5 Big-Ip Domain Name System, F5 Big-Ip Global Traffic Manager.

## How do I fix CVE-2021-22982?

No fix has been published for CVE-2021-22982 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22982 being exploited?

There is no known exploitation of CVE-2021-22982 in the wild and no public exploit code.

## Other vulnerabilities in F5 Big-Ip Domain Name System

- [CVE-2022-23013](https://insights.sbomify.com/CVE-2022-23013/): Cross-site scripting in BIG-IP DNS & GTM (high 8.8)
- [CVE-2026-40061](https://insights.sbomify.com/CVE-2026-40061/): iControl REST and tmsh vulnerability (high 8.5)
- [CVE-2022-41787](https://insights.sbomify.com/CVE-2022-41787/): BIG-IP DNS Express vulnerability CVE-2022-41787 (high 7.5)
- [CVE-2021-23032](https://insights.sbomify.com/CVE-2021-23032/): Denial of service in BIG-IP DNS (high 7.5)
- [CVE-2020-27717](https://insights.sbomify.com/CVE-2020-27717/): Denial of service in BIG-IP DNS (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22982 and fix it if it is affected.

What it is: CVE-2021-22982 is a high-severity memory corruption vulnerability in F5 Big-Ip Domain Name System, published on 12 Feb 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-22982 in the wild and no public exploit code.

Affected product: F5 Big-Ip Domain Name System. 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-2021-22982/ (Markdown: https://insights.sbomify.com/CVE-2021-22982/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22982
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22982
- OSV: https://osv.dev/vulnerability/CVE-2021-22982

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22982/
Summaries are generated and may contain mistakes; the official description above is the record.