CVE-2018-25246Public exploitNetwork attack vector

Application crash via oversized search input

Published Apr 4, 2026 · Updated Apr 4, 2026

Denial of service in Wikipedia 12.0 for Windows allows remote attackers to crash the application through oversized search input. The published proof of concept generates 1,000 repeated A characters; pasting the buffer into the app's upper-right search bar causes termination. No account is required, and the demonstrated consequence is limited to interrupting the affected Windows application.

CVSS severity8.7
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Wikipedia 12.0 for Windows allows remote attackers to crash the application through oversized search input. The published proof of concept generates 1,000 repeated A characters; pasting the buffer into the app's upper-right search bar causes termination. No account is required, and the demonstrated consequence is limited to interrupting the affected Windows application.

The record

CVE
CVE-2018-25246
Published
Apr 4, 2026
Updated
Apr 4, 2026
Vendor
Wikimedia Foundation
Product
Wikipedia
Classifications
CWE-306, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 4, 2026Record 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=12.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · Wikipediaversion=12.0

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1499.004Endpoint Denial of Service: Application 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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