CVE-2023-29139Network attack vector

Authenticated service interruption via repeated log queries

Published Mar 31, 2023 · Updated Feb 14, 2025

Uncontrolled resource consumption in the CheckUser extension for MediaWiki through 1.39.3 allows remote authenticated users to interrupt service. Repeated CheckUserLog API queries consume request-processing capacity until MediaWiki raises RequestTimeoutException or an upstream server times out. Exploitation requires the checkuserlog permission and a configuration in which a high request volume reaches either timeout condition.

CVSS severity6.5
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in the CheckUser extension for MediaWiki through 1.39.3 allows remote authenticated users to interrupt service. Repeated CheckUserLog API queries consume request-processing capacity until MediaWiki raises RequestTimeoutException or an upstream server times out. Exploitation requires the checkuserlog permission and a configuration in which a high request volume reaches either timeout condition.

The record

CVE
CVE-2023-29139
Published
Mar 31, 2023
Updated
Feb 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5NVDCVSS:3.1/AV:N/AC:L/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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