VDB-184145 · CVE-2021-41799 · Nessus 246400

MediaWiki up to 1.36.1 ApiQueryBacklinks resource consumption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in MediaWiki up to 1.36.1 and classified as problematic. Impacted is an unknown function of the component ApiQueryBacklinks. The manipulation leads to resource consumption. This vulnerability is referenced as CVE-2021-41799. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in MediaWiki up to 1.36.1 (Content Management System) and classified as problematic. This issue affects an unknown part of the component ApiQueryBacklinks. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability.

The weakness was published 10/11/2021. The advisory is shared at phabricator.wikimedia.org. The identification of this vulnerability is CVE-2021-41799 since 09/29/2021. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 246400 (Linux Distros Unpatched Vulnerability : CVE-2021-41799), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.31.16, 1.35.4 or 1.36.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (246400). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Content Management System

Name

MediaWiki

Version

License

open-source

Website

Product: https://www.mediawiki.org/wiki/MediaWiki

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 246400
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-41799

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: MediaWiki 1.31.16/1.35.4/1.36.2

Timelineinfo

09/29/2021 🔍
10/11/2021 +12 days 🔍
10/11/2021 +0 days 🔍
08/09/2025 +1398 days 🔍

Sourcesinfo

Product: mediawiki.org

Advisory: FEDORA-2021-56d8173b5e
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-41799 (🔍)
GCVE (CVE): GCVE-0-2021-41799
GCVE (VulDB): GCVE-100-184145

Entryinfo

Created: 10/11/2021 14:32
Updated: 08/09/2025 05:42
Changes: 10/11/2021 14:32 (13), 10/11/2021 14:33 (10), 10/11/2021 14:35 (18), 10/14/2021 12:46 (2), 08/09/2025 05:42 (16)
Complete: 🔍
Committer: roga
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.