CVE-2018-14598
A malicious server can send a reply in which the first string overflows, causing a variable to be set to NULL that will be freed later on, leading to DoS (segmentation fault).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in XListExtensions in ListExt.c in libX11 through 1.6.5. A malicious server can send a reply in which the first string overflows, causing a variable to be set to NULL that will be freed later on, leading to DoS (segmentation fault).
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.23% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- x.org/libx11 · canonical/ubuntu linux · debian/debian linux · fedoraproject/fedora
- Source
- cve@mitre.org
EPSS 4.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2018/08/21/6Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/105177Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041543Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:2079
- https://bugzilla.suse.com/show_bug.cgi?id=1102073Issue Tracking, Patch, Third Party Advisory
- https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=e83722768fd5c467ef61fa159e8c6278770b45c2Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/08/msg00030.htmlThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB7SDV6GO4F/
- https://lists.x.org/archives/xorg-announce/2018-August/002916.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201811-01Third 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/2018/08/21/6Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/105177Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041543Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:2079
- https://bugzilla.suse.com/show_bug.cgi?id=1102073Issue Tracking, Patch, Third Party Advisory
- https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=e83722768fd5c467ef61fa159e8c6278770b45c2Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/08/msg00030.htmlThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB7SDV6GO4F/
- https://lists.x.org/archives/xorg-announce/2018-August/002916.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201811-01Third Party Advisory
- https://usn.ubuntu.com/3758-1/Third Party Advisory
- https://usn.ubuntu.com/3758-2/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.