# CVE-2025-9019: tcpreplay tcpprep cidr.c mask_cidr6 heap-based overflow

> Remote attackers can trigger a heap-based buffer overflow in tcpreplay's tcpprep component, potentially leading to code execution or denial of service.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **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:** 15 Aug 2025
- **Updated:** 15 Aug 2025
- **Also known as:** DEBIAN-CVE-2025-9019, GHSA-f6rq-rhh3-fpff, UBUNTU-CVE-2025-9019

## What is CVE-2025-9019?

CVE-2025-9019 is a low-severity memory corruption vulnerability in Broadcom Tcpreplay, published on 15 Aug 2025. 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

A vulnerability has been found in tcpreplay 4.5.1. This vulnerability affects the function mask_cidr6 of the file cidr.c of the component tcpprep. The manipulation leads to heap-based buffer overflow. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The researcher is able to reproduce this with the latest official release 4.5.1 and the current master branch. The code maintainer cannot reproduce this for 4.5.2-beta1. In his reply the maintainer explains that "[i]n that case, this is a duplicate that was fixed in 4.5.2."

Weakness: CWE-122 (Heap-based Buffer Overflow), CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-9019?

It affects 1 product.


Products: Broadcom Tcpreplay.

## How do I fix CVE-2025-9019?

Upgrade to a fixed version.

## Is CVE-2025-9019 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9019 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-2025-9019 and fix it if it is affected.

What it is: CVE-2025-9019 is a low-severity memory corruption vulnerability in Broadcom Tcpreplay, published on 15 Aug 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9019 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-2025-9019/ (Markdown: https://insights.sbomify.com/CVE-2025-9019/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9019
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9019
- OSV: https://osv.dev/vulnerability/CVE-2025-9019

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9019/
Summaries are generated and may contain mistakes; the official description above is the record.