What is the severity of CVE-2021-31553?

The severity of CVE-2021-31553 is categorized as a denial of service vulnerability.

How do I fix CVE-2021-31553?

To fix CVE-2021-31553, upgrade your MediaWiki installation to version 1.35.3 or later.

What does CVE-2021-31553 affect?

CVE-2021-31553 affects the CheckUser extension for MediaWiki versions up to 1.35.2.

What can an attacker do with CVE-2021-31553?

An attacker can exploit CVE-2021-31553 to cause a denial of service on certain CheckUser extension functionality.

What is the impact of CVE-2021-31553?

The impact of CVE-2021-31553 is that it may lead to inaccessible CheckUser extension pages due to the presence of usernames with trailing whitespace.

Vulnerability/
CVE-2021-31553

medium

6.5

CWE

428

22/4/2021

3/8/2024

CVE-2021-31553

First published: Thu Apr 22 2021(Updated: )

An issue was discovered in the CheckUser extension for MediaWiki through 1.35.2. MediaWiki usernames with trailing whitespace could be stored in the cu_log database table such that denial of service occurred for certain CheckUser extension pages and functionality. For example, the attacker could turn off Special:CheckUserLog and thus interfere with usage tracking.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Wikimedia MediaWiki	<=1.35.2

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-31553?
The severity of CVE-2021-31553 is categorized as a denial of service vulnerability.
How do I fix CVE-2021-31553?
To fix CVE-2021-31553, upgrade your MediaWiki installation to version 1.35.3 or later.
What does CVE-2021-31553 affect?
CVE-2021-31553 affects the CheckUser extension for MediaWiki versions up to 1.35.2.
What can an attacker do with CVE-2021-31553?
An attacker can exploit CVE-2021-31553 to cause a denial of service on certain CheckUser extension functionality.
What is the impact of CVE-2021-31553?
The impact of CVE-2021-31553 is that it may lead to inaccessible CheckUser extension pages due to the presence of usernames with trailing whitespace.

agent/type
agent/references
agent/weakness
agent/severity
agent/author
agent/softwarecombine
agent/description
collector/mitre-cve
source/MITRE
agent/last-modified-date
agent/event
agent/first-publish-date
agent/source
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/mediawiki
canonical/wikimedia mediawiki
version/wikimedia mediawiki/1.35.2

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Frequently Asked Questions

What is the severity of CVE-2021-31553?
The severity of CVE-2021-31553 is categorized as a denial of service vulnerability.
How do I fix CVE-2021-31553?
To fix CVE-2021-31553, upgrade your MediaWiki installation to version 1.35.3 or later.
What does CVE-2021-31553 affect?
CVE-2021-31553 affects the CheckUser extension for MediaWiki versions up to 1.35.2.
What can an attacker do with CVE-2021-31553?
An attacker can exploit CVE-2021-31553 to cause a denial of service on certain CheckUser extension functionality.
What is the impact of CVE-2021-31553?
The impact of CVE-2021-31553 is that it may lead to inaccessible CheckUser extension pages due to the presence of usernames with trailing whitespace.