{
    "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2021-31553",
        "STATE": "PUBLIC"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "n/a",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "n/a"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "n/a"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "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."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "url": "https://phabricator.wikimedia.org/T275669",
                "refsource": "MISC",
                "name": "https://phabricator.wikimedia.org/T275669"
            },
            {
                "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023",
                "refsource": "MISC",
                "name": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023"
            },
            {
                "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024",
                "refsource": "MISC",
                "name": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024"
            },
            {
                "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025",
                "refsource": "MISC",
                "name": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025"
            },
            {
                "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027",
                "refsource": "MISC",
                "name": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027"
            },
            {
                "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963",
                "refsource": "MISC",
                "name": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963"
            },
            {
                "url": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964",
                "refsource": "MISC",
                "name": "https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964"
            }
        ]
    }
}