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Fencer Vulns
medium 5.5

CVE-2018-18407 json

A heap-based buffer over-read was discovered in the tcpreplay-edit binary of Tcpreplay 4.3.0 beta1, during the incremental checksum operati…

published 2018-10-17 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10136

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

A heap-based buffer over-read was discovered in the tcpreplay-edit binary of Tcpreplay 4.3.0 beta1, during the incremental checksum operation. The issue gets triggered in the function csum_replace4() in incremental_checksum.h, causing a denial of service.

Patch / fix

  • tcpreplay Debian 14, Debian 13, Debian 12 4.3.1-1

debian advisories DEBIAN-CVE-2018-18407

  • tcpreplay Ubuntu Pro 16.04 LTS 3.4.4-2+deb8u1ubuntu0.1~esm1
  • tcpreplay Ubuntu Pro 18.04 LTS 4.2.6-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2018-18407

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 Tumbleweed 4.3.4-1.3

opensuse advisories openSUSE-SU-2024:11426-1

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-2018-18407 updated cvss 3.3

tcpreplay: heap-based buffer over-read in csum_replace4 function in incremental_checksum.h

  • 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

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/appneta/tcpreplay/issues/488 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/SegfaultMasters/covering360/blob/master/tcpreplay/README.md#user-content-heap-overflow-in-csum_replace4 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

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.