CVE-2018-14599

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other impact.

Published: Aug 24, 2018
Updated: Nov 9, 2025
CVE: CVE-2018-14599
Severity: Critical
Exploit:

CVSS v3:

Severity: Critical
Score: 9.8
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

Severity: High
Score: 7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P

CWEs:

CWE-193

Affected Software
References

Software	From	Fixed in
x.org / libx11	-	1.6.5.x
debian / debian_linux	8.0	8.0.x
canonical / ubuntu_linux	16.04	16.04.x
canonical / ubuntu_linux	14.04	14.04.x
canonical / ubuntu_linux	12.04	12.04.x
canonical / ubuntu_linux	18.04	18.04.x
fedoraproject / fedora	28	28.x
redhat / enterprise_linux_desktop	7.0	7.0.x
redhat / enterprise_linux_workstation	7.0	7.0.x
redhat / enterprise_linux_server	7.0	7.0.x

http://www.openwall.com/lists/oss-security/2018/08/21/6
http://www.securityfocus.com/bid/105177
http://www.securitytracker.com/id/1041543
https://access.redhat.com/errata/RHSA-2019:2079
https://bugzilla.suse.com/show_bug.cgi?id=1102062
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0
https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB7SDV6GO4F/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB7SDV6GO4F/
https://lists.x.org/archives/xorg-announce/2018-August/002916.html
https://security.gentoo.org/glsa/201811-01
https://usn.ubuntu.com/3758-1/
https://usn.ubuntu.com/3758-2/

Vulnerability Database

300,445

CVE-2018-14599

Deep Security Visibility Without the Complexity