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Fencer Vulns
high 7.8

CVE-2018-20553 json

Tcpreplay before 4.3.1 has a heap-based buffer over-read in get_l2len in common/get.c.

published 2018-12-28 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13107

cvss
7.8
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

Tcpreplay before 4.3.1 has a heap-based buffer over-read in get_l2len in common/get.c.

Patch / fix

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

debian advisories DEBIAN-CVE-2018-20553

  • tcpreplay Ubuntu Pro 16.04 LTS 3.4.4-2+deb8u1ubuntu0.1~esm2
  • tcpreplay Ubuntu Pro 18.04 LTS 4.2.6-1ubuntu0.1~esm2
  • tcpreplay Ubuntu Pro 20.04 LTS 4.3.2-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2018-20553

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

Exploit prediction

1.25% 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/530 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/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.