CVE-2021-3472

What it is

A flaw was found in xorg-x11-server in versions before 1.20.11. An integer underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-04-26 15:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:05 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.1% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-04-26 15:15 UTC

Last modified

2026-06-17 04:05 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-191

Record status

Modified

Affected

• x.org X Server < 1.20.11
• Fedoraproject Fedora 32
• Fedoraproject Fedora 33
• Fedoraproject Fedora 34
• Debian Linux 9.0
• Debian Linux 10.0
• Redhat Enterprise Linux 7.0
• Redhat Enterprise Linux 8.0

Attack profile CVSS 3.1 · 7.8

Attack vector

Local

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-3472.md and follow it. Check whether this project is affected by CVE-2021-3472. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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