CVE-2022-49737Public exploitNetwork attack vector

Authenticated server crash via unlocked device attachment

Published Mar 16, 2025 · Updated Mar 17, 2025

Race condition in X.Org Server 20.11 through 21.1.16 allows remote authenticated users to crash the server via queued input events. AttachDevice in dix/devices.c updates device structures on the main thread without holding the input lock while easystroke drives concurrent input-thread activity. Access as an X client and favorable race timing are required; successful triggering terminates the graphical session and returns users to the login screen.

CVSS severity7.7
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in X.Org Server 20.11 through 21.1.16 allows remote authenticated users to crash the server via queued input events. AttachDevice in dix/devices.c updates device structures on the main thread without holding the input lock while easystroke drives concurrent input-thread activity. Access as an X client and favorable race timing are required; successful triggering terminates the graphical session and returns users to the login screen.

The record

CVE
CVE-2022-49737
Published
Mar 16, 2025
Updated
Mar 17, 2025
Vendor
X.Org
Product
X.Org Server
Classifications
CWE-413, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20.11 <=21.1.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

X.Org · X.Org Serverversion=20.11 <=21.1.16

Published CVSS scores

7.7MITRECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-413Improper Resource Locking
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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