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CVE-2020-14363

HIGH
7.8
CVSS Score
Published: September 11, 2020 at 06:02 PM UTC
Updated: June 17, 2026 at 02:54 AM UTC
3 products affected across 3 vendorsFedoraLIBX11libX11

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Severity
HIGH7.8
Exploit prediction
EPSS 0.6%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
33
LIBX11· X Org
95%
v < 1.6.12
Affected range stops below 1.6.12, so it looks safe — our inference, not a vendor statement
libX11· X11
60%
1.6.12

References (6)

x_refsource_CONFIRMIssue TrackingThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14363
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/Ruia-ruia/Exploits/blob/master/DFX11details.txt
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/Ruia-ruia/Exploits/blob/master/x11doublefree.sh
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7AVXCQOSCAPKYYHFIJAZ6E2C7LJBTLXF/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://lists.x.org/archives/xorg-announce/2020-August/003056.html
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/4487-2/

CVSS

7.8HIGHredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-190CWE-416

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