Skip to content
Fencer Vulns
medium 5.5

CVE-2023-4256 json

Tcpreplay: tcprewrite: double free in tcpedit_dlt_cleanup() in plugins/dlt_plugins.c

published 2023-12-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54127

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

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.

Patch / fix

  • tcpreplay Debian 14, Debian 13 4.5.1-1

debian advisories DEBIAN-CVE-2023-4256

  • tcpreplay Ubuntu Pro 18.04 LTS 4.2.6-1ubuntu0.1~esm5
  • tcpreplay Ubuntu Pro 20.04 LTS 4.3.2-1ubuntu0.1~esm3
  • tcpreplay Ubuntu Pro 22.04 LTS 4.3.4-1ubuntu0.1~esm2
  • tcpreplay Ubuntu Pro 24.04 LTS 4.4.4-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2023-4256

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tcpreplay openSUSE Leap 16.0 4.5.2-bp160.1.1

opensuse advisories openSUSE-SU-2025:20119-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-4256 updated cvss 5.5

tcpreplay: tcprewrite: double free in tcpedit_dlt_cleanup() in plugins/dlt_plugins.c

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2255212 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/appneta/tcpreplay/issues/813 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

  • n/a tcpreplay
  • Fedora Extra Packages for Enterprise Linux
  • Fedora Fedora

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.