CVE-2020-14346

Name: CVE-2020-14346
Creator: NVD / NIST
Published: 2020-09-15T19:15:12.743+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2020-14346 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.60%

44.4th 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
Canonical	Ubuntu Linux	14.04
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1862246Issue Tracking, Third Party Advisory
https://lists.x.org/archives/xorg-announce/2020-August/003058.htmlMailing List, Patch, Vendor Advisory
https://security.gentoo.org/glsa/202012-01Third Party Advisory
https://usn.ubuntu.com/4488-2/Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-1417/Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1862246Issue Tracking, Third Party Advisory
https://lists.x.org/archives/xorg-announce/2020-August/003058.htmlMailing List, Patch, Vendor Advisory
https://security.gentoo.org/glsa/202012-01Third Party Advisory
https://usn.ubuntu.com/4488-2/Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-1417/Third Party Advisory, VDB Entry

Timeline

Published: Sep 15, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14346?

How severe is CVE-2020-14346?

CVE-2020-14346 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14346?

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-2020-14346?

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

Scan your code now

Source: NVD / NIST