# CVE-2023-27787: Null dereference in n/a

> A remote attacker can cause a denial of service in TCPprep via a null pointer dereference in the parse_list function.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** Yes
- **Published:** 16 Mar 2023
- **Updated:** 26 Feb 2025
- **Also known as:** DEBIAN-CVE-2023-27787, GHSA-85q7-h847-vf82, UBUNTU-CVE-2023-27787

## What is CVE-2023-27787?

CVE-2023-27787 is a high-severity vulnerability in Broadcom Tcpreplay, published on 16 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue found in TCPprep v.4.4.3 allows a remote attacker to cause a denial of service via the parse_list function at the list.c:81 endpoint.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2023-27787?

It affects 1 product.


Products: Broadcom Tcpreplay.

## How do I fix CVE-2023-27787?

Upgrade to a fixed version.

## Is CVE-2023-27787 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-27787 exists.

## 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-2023-27787 and fix it if it is affected.

What it is: CVE-2023-27787 is a high-severity vulnerability in Broadcom Tcpreplay, published on 16 Mar 2023. 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-2023-27787 exists.

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-2023-27787/ (Markdown: https://insights.sbomify.com/CVE-2023-27787/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-27787
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-27787
- OSV: https://osv.dev/vulnerability/CVE-2023-27787

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-27787/
Summaries are generated and may contain mistakes; the official description above is the record.