CVE-2025-53481Network attack vector

Service degradation via unindexed IP lookup queries

Published Jul 4, 2025 · Updated Jul 8, 2025

Uncontrolled resource consumption in Wikimedia Foundation MediaWiki IPInfo allows remote attackers to delay database queries via IP lookups. The ipinfo/v0/norevision path invokes AnonymousUserIPLookup::checkIPIsKnown, whose cu_private_event join and abuse_filter_log lookup scan millions of rows when an IP has no edits. Endpoint access controls limit reachability, while repeated qualifying requests consume database time and degrade availability.

CVSS severity7.5
High
EPSS probability0.42%
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 Wikimedia Foundation MediaWiki IPInfo allows remote attackers to delay database queries via IP lookups. The ipinfo/v0/norevision path invokes AnonymousUserIPLookup::checkIPIsKnown, whose cu_private_event join and abuse_filter_log lookup scan millions of rows when an IP has no edits. Endpoint access controls limit reachability, while repeated qualifying requests consume database time and degrade availability.

The record

CVE
CVE-2025-53481
Published
Jul 4, 2025
Updated
Jul 8, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki IPInfo Extension
Classifications
CWE-400, CAPEC-130, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=1.39.x <1.39.13
  2. Affected versionversion=1.42.x <1.42.7
  3. Affected versionversion=1.43.x <1.43.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · MediaWiki IPInfo Extensionversion=1.39.x <1.39.13; version=1.42.x <1.42.7; version=1.43.x <1.43.2

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CAPEC-130Excessive Allocation
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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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