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Vulnerability record · CVE-2018-14599 · published 24 August 2018

CVE-2018-14599: X.org libx11 vulnerability

XX.Org · Libx11

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.

9.8 CVSS 3.1 Critical EPSS 4.8% · top 8.3% CWE-193 · CWE-193
9.8CVSS 3.1 base score, v2 7.5
4.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2018/08/21/6 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105177 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041543 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2079 Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1102062 Issue TrackingPatchThird Party Advisory
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB
https://lists.x.org/archives/xorg-announce/2018-August/002916.html Third Party Advisory
https://security.gentoo.org/glsa/201811-01 Third Party Advisory
https://usn.ubuntu.com/3758-1/ Third Party Advisory
https://usn.ubuntu.com/3758-2/ Third Party Advisory
http://www.openwall.com/lists/oss-security/2018/08/21/6 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105177 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041543 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2079 Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1102062 Issue TrackingPatchThird Party Advisory
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB
https://lists.x.org/archives/xorg-announce/2018-August/002916.html Third Party Advisory
https://security.gentoo.org/glsa/201811-01 Third Party Advisory
https://usn.ubuntu.com/3758-1/ Third Party Advisory
https://usn.ubuntu.com/3758-2/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-14599), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.