Skip to content
Fencer Vulns
medium 5.5

CVE-2018-19519 json

In tcpdump 4.9.2, a stack-based buffer over-read exists in the print_prefix function of print-hncp.c via crafted packet data because of mis…

published 2018-11-25 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11208

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

In tcpdump 4.9.2, a stack-based buffer over-read exists in the print_prefix function of print-hncp.c via crafted packet data because of missing initialization.

Patch / fix

  • tcpdump Ubuntu 16.04 LTS 4.9.3-0ubuntu0.16.04.1
  • tcpdump Ubuntu 18.04 LTS 4.9.3-0ubuntu0.18.04.1
  • tcpdump Ubuntu Pro 14.04 LTS 4.9.3-0ubuntu0.14.04.1+esm1

ubuntu advisories UBUNTU-CVE-2018-19519

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

  • tcpdump RHEL 8 14:4.9.2-6.el8
  • tcpdump RHEL 7 14:4.9.2-4.el7_7.1

red hat advisories RHSA-2020:1604RHSA-2019:3976

  • tcpdump SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4 +3 more 4.9.2-14.8.1
  • tcpdump SLE Module for Basesystem 15 4.9.2-3.3.1

suse advisories SUSE-SU-2018:4149-1SUSE-SU-2018:4131-1

  • tcpdump openSUSE Tumbleweed 4.99.1-1.2

opensuse advisories openSUSE-SU-2024:11425-1

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-2018-19519 updated cvss 4.3

tcpdump: Stack-based buffer over-read in print-hncp.c:print_prefix() via crafted pcap

  • Red Hat Enterprise Linux AppStream (v. 8) tcpdump 4.9.2-6.el8
    fixed: vendor fix RHSA-2020:1604
  • Red Hat Enterprise Linux Client (v. 7) tcpdump 4.9.2-4.el7_7.1 Red Hat Enterprise Linux ComputeNode (v. 7) tcpdump 4.9.2-4.el7_7.1 Red Hat Enterprise Linux Server (v. 7) tcpdump 4.9.2-4.el7_7.1 Red Hat Enterprise Linux Workstation (v. 7) tcpdump 4.9.2-4.el7_7.1
    fixed: vendor fix RHSA-2019:3976
  • Red Hat Enterprise Linux 5 tcpdump Red Hat Enterprise Linux 6 tcpdump
    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

2.59% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/zyingp/temp/blob/master/tcpdump.md 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:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-909 Missing Initialization of Resource

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.