{"id":"CVE-2021-23364","aliases":["CLSA-2026-1774311645","CLSA-2026-1777163887","CLSA-2026-1788560456","DEBIAN-CVE-2021-23364","EUVD-2021-1216","GHSA-w8qv-6jwh-64r5","ROOT-APP-NPM-CVE-2021-23364","UBUNTU-CVE-2021-23364"],"status":"published","title":"Regular Expression Denial of Service (ReDoS)","description":"The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.02383,"percentile":0.84025,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333","CWE-400"],"published":"2021-04-28T15:35:19Z","modified":"2026-10-23T18:03:12Z","fixes":[{"ecosystem":"npm","package":"browserslist","fixed_in":["4.16.5"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"browserslist","fixed_in":["4.13.0-tuxcare.1","4.10.0-tuxcare.2","4.14.2-tuxcare.1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"node-browserslist","fixed_in":["4.16.3+~cs5.4.72-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"node-browserslist","fixed_in":["4.16.3+~cs5.4.72-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"node-browserslist","fixed_in":["4.16.3+~cs5.4.72-2"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"browserslist","fixed_in":["4.14.2-aikido.2","4.14.2-aikido.1","4.15.0-aikido.1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/browserslist","fixed_in":["4.14.2-root.io.2","4.14.2-root.io.1","4.15.0-root.io.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.16.5"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.13.0-tuxcare.0"},{"fixed":"4.13.0-tuxcare.1"}]}],"versions":["4.13.0"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0-tuxcare.0"},{"fixed":"4.10.0-tuxcare.2"}]}],"versions":["4.10.0","4.10.0-tuxcare.1"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.14.2-tuxcare.0"},{"fixed":"4.14.2-tuxcare.1"}]}],"versions":["4.14.2"]},{"source":"osv","ecosystem":"Debian:12","package":"node-browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.16.3+~cs5.4.72-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"node-browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.16.3+~cs5.4.72-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"node-browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.16.3+~cs5.4.72-2"}]}]},{"source":"osv","ecosystem":"npm","package":"browserslist","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.16.5"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.2-aikido.2"},{"fixed":"4.14.2-aikido.1"},{"fixed":"4.15.0-aikido.1"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"@rootio/browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.2-root.io.2"},{"fixed":"4.14.2-root.io.1"},{"fixed":"4.15.0-root.io.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"node-browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11.3-1","2.11.3-1build3","2.11.3-1build4"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"node-browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11.3-1build4"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"node-browserslist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.16.3+~cs5.4.72-3","4.17.0+~cs5.6.76-1","4.18.1+~cs5.1.2-1","4.19.1+~cs5.1.2-1","4.19.1+repack+~cs5.1.2-2","4.19.3+~cs5.1.3-1"]}],"products":[{"vendor":"browserslist_project","product":"browserslist"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-BROWSERSLIST-1090194","tags":["x_refsource_MISC","x_transferred","Exploit","Patch","Third Party Advisory","fix","web","report"]},{"url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1277182","tags":["x_refsource_MISC","x_transferred","Exploit","Patch","Third Party Advisory","fix","web","report"]},{"url":"https://github.com/browserslist/browserslist/blob/e82f32d1d4100d6bc79ea0b6b6a2d281a561e33c/index.js%23L472-L474","tags":["x_refsource_MISC","x_transferred","Broken Link","web","report"]},{"url":"https://github.com/browserslist/browserslist/commit/c091916910dfe0b5fd61caad96083c6709b02d98","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web","report"]},{"url":"https://github.com/browserslist/browserslist/pull/593","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23364","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-w8qv-6jwh-64r5"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-23364","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-23364","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-23364","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-23364","title":"Regular Expression Denial of Service (ReDoS)","description":"The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.","status":"published","published":"2021-04-28T15:35:19.189Z","modified":"2024-09-17T00:06:27.59Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2021-1216","description":"The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.","status":"published","published":"2021-04-28T15:35:19Z","modified":"2024-09-17T00:06:27Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P","level":"medium"}],"updated_at":"2026-11-03T00:29:01.977589Z"}],"ghsa":[{"id":"GHSA-w8qv-6jwh-64r5","title":"Regular Expression Denial of Service in browserslist","description":"The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.","status":"published","published":"2021-05-24T19:52:40Z","modified":"2023-08-17T05:02:30Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T14:37:00.074932Z"}],"nvd":[{"id":"CVE-2021-23364","description":"The package browserslist 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