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Fencer Vulns
medium 6.5

CVE-2023-43279 json

Null Pointer Dereference in mask_cidr6 component at cidr.c in Tcpreplay 4.4.4 allows attackers to crash the application via crafted tcprewr…

published 2024-03-12 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-47698

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Null Pointer Dereference in mask_cidr6 component at cidr.c in Tcpreplay 4.4.4 allows attackers to crash the application via crafted tcprewrite command.

Patch / fix

  • tcpreplay Debian 14, Debian 13 4.5.1-1

debian advisories DEBIAN-CVE-2023-43279

  • tcpreplay Ubuntu Pro 16.04 LTS 3.4.4-2+deb8u1ubuntu0.1~esm3
  • 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-2023-43279

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-2023-43279 updated cvss 3.3

tcpreplay: null pointer dereference in mask_cidr6 component at cidr.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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/appneta/tcpreplay/issues/824 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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.