{"id":"CVE-2021-21317","state":"PUBLISHED","title":"Denial of Service in uap-core","description":"uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This is fixed in version 0.11.0. Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.","publishedAt":"2021-02-16T17:45:16.000Z","updatedAt":"2024-08-03T18:09:15.054Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["ua-parser uap-core"],"affected":[{"vendor":"ua-parser","product":"uap-core","versions":[{"version":"< 0.11.0","status":"affected"}]}],"references":["https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4","https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c","https://www.npmjs.com/package/uap-core"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T19:47:59.168Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/21xxx/CVE-2021-21317.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-21317","state":"PUBLISHED","datePublished":"2021-02-16T17:45:16.000Z","dateUpdated":"2024-08-03T18:09:15.054Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2020-12-22T00:00:00.000Z"},"containers":{"cna":{"title":"Denial of Service in uap-core","descriptions":[{"lang":"en","value":"uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This is fixed in version 0.11.0. 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