Suricata version 4.0.4 incorrectly handles the parsing of the SSH banner.

published 2019-04-04 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-2316

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits: 0; none known

Suricata version 4.0.4 incorrectly handles the parsing of the SSH banner. A malformed SSH banner can cause the parsing code to read beyond the allocated data because SSHParseBanner in app-layer-ssh.c lacks a length check.

Patch / fix

distros 1

suricata Debian 14, Debian 13 1:4.0.5-1

debian advisories DEBIAN-CVE-2018-10242

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-2018-10242 updated 2025-11-21 cvss 3.7

suricata: incorrect handling of SSH parsing banner leads to out-of-bound read

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

1.53% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-125 Out-of-bounds Read

References

suricata-ids.org /2018/07/18/suricata-4-0-5-available/
release-notes, vendor-advisory
lists.debian.org /debian-lts-announce/2019/04/msg00010.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2018-10242
NVD CVE-2018-10242

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.

Summary