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Vulnerability record · CVE-2020-14363 · published 11 September 2020

CVE-2020-14363: X.org libx11 integer overflow vulnerability

XX.Org · Libx11

An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.

7.8 CVSS 3.1 High EPSS 0.58% · top 54.5% CWE-190 · Integer overflowCWE-416 · Use after free
7.8CVSS 3.1 base score, v2 4.6
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.

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

Affected products

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

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14363 Issue TrackingThird Party Advisory
https://github.com/Ruia-ruia/Exploits/blob/master/DFX11details.txt Third Party Advisory
https://github.com/Ruia-ruia/Exploits/blob/master/x11doublefree.sh ExploitThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7AVXCQOSCAPKYYHFIJAZ6E2
https://lists.x.org/archives/xorg-announce/2020-August/003056.html Vendor Advisory
https://usn.ubuntu.com/4487-2/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14363 Issue TrackingThird Party Advisory
https://github.com/Ruia-ruia/Exploits/blob/master/DFX11details.txt Third Party Advisory
https://github.com/Ruia-ruia/Exploits/blob/master/x11doublefree.sh ExploitThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7AVXCQOSCAPKYYHFIJAZ6E2
https://lists.x.org/archives/xorg-announce/2020-August/003056.html Vendor Advisory
https://usn.ubuntu.com/4487-2/ Third Party Advisory

Track CVE-2020-14363 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2020-14363), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.