FKIE_CVE-2021-31553
Vulnerability from fkie_nvd - Published: 2021-04-22 03:15 - Updated: 2026-06-17 03:51
Severity
Summary
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.
References
{
"affected": [
{
"affectedData": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"source": "cve@mitre.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4067807D-769C-485F-A7E3-EE96885BDCE7",
"versionEndIncluding": "1.35.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Se detect\u00f3 un problema en la extensi\u00f3n CheckUser para MediaWiki versiones hasta 1.35.2.\u0026#xa0;Unos nombres de usuario de MediaWiki con espacios en blanco al final podr\u00edan ser almacenados en la tabla de la base de datos cu_log de manera que se produjera una denegaci\u00f3n de servicio para determinadas p\u00e1ginas de extensi\u00f3n y funcionalidad CheckUser.\u0026#xa0;Por ejemplo, el atacante podr\u00eda desactivar Special: CheckUserLog y as\u00ed interferir con el seguimiento del uso"
}
],
"id": "CVE-2021-31553",
"lastModified": "2026-06-17T03:51:59.787",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 6.4,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 4.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 2.5,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-04-22T03:15:08.197",
"references": [
{
"source": "cve@mitre.org",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963"
},
{
"source": "cve@mitre.org",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964"
},
{
"source": "cve@mitre.org",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023"
},
{
"source": "cve@mitre.org",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024"
},
{
"source": "cve@mitre.org",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025"
},
{
"source": "cve@mitre.org",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://phabricator.wikimedia.org/T275669"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://phabricator.wikimedia.org/T275669"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-428"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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