{"id":"CVE-2020-5243","aliases":["GHSA-cmcx-xhr8-3w9p"],"url":"https://o3.security/vulnerability/CVE-2020-5243","summary":"Denial of Service in uap-core when processing crafted User-Agent strings","details":"uap-core before 0.7.3 is vulnerable to a denial of service attack when processing crafted User-Agent strings. 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 has been patched in uap-core 0.7.3.","published":"2020-02-21T00:15:10.960Z","modified":"2026-07-09T10:52:45.969449Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"uap-core","fixedVersion":"0.7.3"},{"ecosystem":"RubyGems","name":"user_agent_parser","fixedVersion":"2.6.0"}],"fix":{"url":"https://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1","label":"ua-parser/uap-core@0afd61e"},"references":[{"type":"FIX","url":"https://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1"},{"type":"EVIDENCE","url":"https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9p"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T10:52:45.969449Z"}}