CVE-2018-10242

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

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

1.53%Up 0.9 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2018-10242
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness: CWE-125
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-10242
Updated: 2026-11-02

EUVDEUVD-2018-2316 No score

Record: EUVD-2018-2316
Updated: 2026-11-03

GitHub AdvisoriesGHSA-xrxh-g8jf-mf2m 7.5

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

Record: GHSA-xrxh-g8jf-mf2m
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-125
Updated: 2026-11-02

OSV 7.5

Record: CVE-2018-10242
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2018-10242 7.5

Record: DEBIAN-CVE-2018-10242
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2018-10242 7.5

Record: UBUNTU-CVE-2018-10242
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`suricata` Debian:13	before 1:4.0.5-1	1:4.0.5-1
`suricata` Debian:14	before 1:4.0.5-1	1:4.0.5-1
`suricata` Debian:8 From an advisory covering 2 CVEs	before 2.0.7-2+deb8u4, plus listed versions 2.0.7-22.0.7-2+deb8u12.0.7-2+deb8u22.0.7-2+deb8u3	2.0.7-2+deb8u4
`suricata` Ubuntu:16.04:LTS	All versions, plus listed versions 2.0.8-1build12.0.9-12.0.10-12.0.10-22.0.11-13.0-1	None known
`suricata` Ubuntu:18.04:LTS	All versions, plus listed versions 3.2-2ubuntu3	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-10242 is a high vulnerability (CVSS 7.5) in Oisf Suricata, published April 4, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.53%, the 74th percentile. Fixed in suricata 1:4.0.5-1.