HOME VULNERABILITIESCVE-2018-14599

CRITICAL

CVE-2018-14599

CWE-193Published: August 24, 2018· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

Technical Analysis

CVE-2018-14599 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

Red Hat3 product(s)

enterprise linux desktopenterprise linux serverenterprise linux workstation

x.org1 product(s)

libx11

Source: NVD CPE · 10 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.suse.com/show_bug.cgi?id=1102062

PATCHhttps://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0

PATCHhttps://bugzilla.suse.com/show_bug.cgi?id=1102062

PATCHhttps://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0

ADVISORYhttp://www.openwall.com/lists/oss-security/2018/08/21/6

ADVISORYhttp://www.securityfocus.com/bid/105177

ADVISORYhttp://www.securitytracker.com/id/1041543

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2079

ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/08/msg00030.html

ADVISORYhttps://lists.x.org/archives/xorg-announce/2018-August/002916.html

ADVISORYhttps://security.gentoo.org/glsa/201811-01

ADVISORYhttps://usn.ubuntu.com/3758-1/

ADVISORYhttps://usn.ubuntu.com/3758-2/

ADVISORYhttp://www.openwall.com/lists/oss-security/2018/08/21/6

ADVISORYhttp://www.securityfocus.com/bid/105177

ADVISORYhttp://www.securitytracker.com/id/1041543

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2079

ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/08/msg00030.html

ADVISORYhttps://lists.x.org/archives/xorg-announce/2018-August/002916.html

ADVISORYhttps://security.gentoo.org/glsa/201811-01

ADVISORYhttps://usn.ubuntu.com/3758-1/

ADVISORYhttps://usn.ubuntu.com/3758-2/

All References (24)

→

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-2019:2079Third Party Advisory

→

https://bugzilla.suse.com/show_bug.cgi?id=1102062Issue Tracking · Patch · Third Party Advisory

→

https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0Patch · 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

Quick Facts

CVE IDCVE-2018-14599

CVSS Score9.8 / 10

SeverityCRITICAL

WeaknessCWE-193

CISA KEVNo

Affected5 vendor(s)

PublishedAug 24, 2018

Related CVEs (CWE-193)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2018-14599 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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