# CVE-2023-43279: Null dereference in n/a

> Attackers can crash Tcpreplay via crafted input in the mask_cidr6 component, causing a denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 12 Mar 2024
- **Updated:** 4 Nov 2025
- **Also known as:** DEBIAN-CVE-2023-43279, GHSA-34xc-f3c2-9gxw, UBUNTU-CVE-2023-43279

## What is CVE-2023-43279?

CVE-2023-43279 is a medium-severity vulnerability in Broadcom Tcpreplay, published on 12 Mar 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Null Pointer Dereference in mask_cidr6 component at cidr.c in Tcpreplay 4.4.4 allows attackers to crash the application via crafted tcprewrite command.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2023-43279?

It affects 2 products.


Products: Broadcom Tcpreplay, Fedoraproject Fedora.

## How do I fix CVE-2023-43279?

Upgrade to a fixed version.

## Is CVE-2023-43279 being exploited?

There is no known exploitation of CVE-2023-43279 in the wild and no public exploit code.

## Other vulnerabilities in Broadcom Tcpreplay

- [CVE-2018-18408](https://insights.sbomify.com/CVE-2018-18408/): Use after free in n/a (critical 9.8)
- [CVE-2020-12740](https://insights.sbomify.com/CVE-2020-12740/): Memory corruption in n/a (critical 9.1)
- [CVE-2025-51006](https://insights.sbomify.com/CVE-2025-51006/): Use after free in n/a (high 7.8)
- [CVE-2022-37047](https://insights.sbomify.com/CVE-2022-37047/): Memory corruption in n/a (high 7.8)
- [CVE-2022-37048](https://insights.sbomify.com/CVE-2022-37048/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43279 and fix it if it is affected.

What it is: CVE-2023-43279 is a medium-severity vulnerability in Broadcom Tcpreplay, published on 12 Mar 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-43279 in the wild and no public exploit code.

Affected product: Broadcom Tcpreplay. 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-2023-43279/ (Markdown: https://insights.sbomify.com/CVE-2023-43279/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43279
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43279
- OSV: https://osv.dev/vulnerability/CVE-2023-43279

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43279/
Summaries are generated and may contain mistakes; the official description above is the record.