CVE-2020-14347

Name: CVE-2020-14347
Creator: NVD / NIST
Published: 2020-08-05T14:15:12.56+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.39%

Last modified Jun 17, 2026

CVE-2020-14347 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server memory to the X client. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

Description

A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.39%

30.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
X.Org	X Server	< 1.20.9
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	20.04

References

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00066.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00075.htmlBroken Link
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14347Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00057.htmlMailing List, Third Party Advisory
https://lists.x.org/archives/xorg-announce/2020-July/003051.htmlMailing List, Patch, Vendor Advisory
https://security.gentoo.org/glsa/202012-01Third Party Advisory
https://usn.ubuntu.com/4488-1/Third Party Advisory
https://usn.ubuntu.com/4488-2/Third Party Advisory
https://www.debian.org/security/2020/dsa-4758Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/07/31/2Mailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00066.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00075.htmlBroken Link
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14347Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00057.htmlMailing List, Third Party Advisory
https://lists.x.org/archives/xorg-announce/2020-July/003051.htmlMailing List, Patch, Vendor Advisory
https://security.gentoo.org/glsa/202012-01Third Party Advisory
https://usn.ubuntu.com/4488-1/Third Party Advisory
https://usn.ubuntu.com/4488-2/Third Party Advisory
https://www.debian.org/security/2020/dsa-4758Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/07/31/2Mailing List, Third Party Advisory

Timeline

Published: Aug 5, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14347?

How severe is CVE-2020-14347?

CVE-2020-14347 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14347?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14347?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST