CVE-2020-14361

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-09-15 · updated 2026-06-17
Weakness: CWE-191

Description

A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Affected products

Canonical Ubuntu Linux: 14.04
Red Hat Enterprise Linux: 6.0, 7.0, 8.0
xorg-x11-server: before 1.20.9 — fixed in 1.20.9

How to fix

Upgrade to a fixed version: xorg-x11-server 1.20.9. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1869142
https://lists.x.org/archives/xorg-announce/2020-August/003058.html
https://security.gentoo.org/glsa/202012-01
https://usn.ubuntu.com/4488-2/
https://www.zerodayinitiative.com/advisories/ZDI-20-1418/
https://bugzilla.redhat.com/show_bug.cgi?id=1869142
https://lists.x.org/archives/xorg-announce/2020-August/003058.html
https://security.gentoo.org/glsa/202012-01
https://usn.ubuntu.com/4488-2/
https://www.zerodayinitiative.com/advisories/ZDI-20-1418/

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