{"schemaVersion":3,"id":"CVE-2021-33587","aliases":["UBUNTU-CVE-2021-33587","DEBIAN-CVE-2021-33587","GHSA-q8pj-2vqx-8ggc"],"status":"published","duplicateOf":null,"title":null,"description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.","dates":{"published":"2021-05-28T00:00:00.000Z","modified":"2024-08-03T23:50:43.024Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","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","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","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","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Npm","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","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02036,"percentile":0.80796,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":-0.23099999999999996,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.02267},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02036,"percentile":0.80796}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02267,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02178,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02036,"percentile":0.80796}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"css-what_project","product":"css-what","name":"css-what","label":"css-what","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"4.0.0","noFixRecorded":false,"fixedIn":null},{"text":"5.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"4.0.0 | 5.0.0","eol":null,"hubHref":"/vendor/css-what_project/css-what"},{"vendor":"debian","product":"node-css-what","name":"node-css-what","label":"node-css-what","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/node-css-what","purlType":"deb","versions":[{"text":"< 5.0.1-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.0.1-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"node-css-what","name":"node-css-what","label":"node-css-what","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/node-css-what","purlType":"deb","versions":[{"text":"< 2.1.0-1ubuntu0.16.04.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.1.0-1+deb10u1build0.18.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 3.2.1-1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"< 2.1.0-1ubuntu0.16.04.1~esm1 | < 2.1.0-1+deb10u1build0.18.04.1 | < 3.2.1-1ubuntu0.1~esm1 | All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"netapp","product":"e-series_performance_analyzer","name":"e-series performance analyzer","label":"e-series_performance_analyzer","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/netapp/e-series_performance_analyzer"},{"vendor":"Npm","product":"css-what","name":"css-what","label":"css-what","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/css-what","purlType":"npm","versions":[{"text":"≥ 4.0.0, < 5.0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.0, < 5.0.1","eol":null,"hubHref":null}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/fb55/css-what/releases/tag/v5.0.1","label":"github.com/fb55/css-what/releases/tag/v5.0.1","hostname":"github.com","tags":["REPORT","WEB","Patch","Release Notes","Third Party Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20210706-0007/","label":"security.netapp.com/advisory/ntap-20210706-0007/","hostname":"security.netapp.com","tags":["Third Party Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2023/03/msg00001.html","label":"lists.debian.org/debian-lts-announce/2023/03/msg00001.html","hostname":"lists.debian.org","tags":["Mailing List","WEB"]},{"url":"https://ubuntu.com/security/CVE-2021-33587","label":"ubuntu.com/security/CVE-2021-33587","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-6065-1","label":"ubuntu.com/security/notices/USN-6065-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-33587","label":"www.cve.org/CVERecord?id=CVE-2021-33587","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-33587","label":"security-tracker.debian.org/tracker/CVE-2021-33587","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33587","label":"nvd.nist.gov/vuln/detail/CVE-2021-33587","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/fb55/css-what/commit/4cdaacfd0d4b6fd00614be030da0dea6c2994655","label":"github.com/fb55/css-what/commit/4cdaacfd0d4b6fd00614be030da0dea6c2994655","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/fb55/css-what","label":"github.com/fb55/css-what","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://security.netapp.com/advisory/ntap-20210706-0007","label":"security.netapp.com/advisory/ntap-20210706-0007","hostname":"security.netapp.com","tags":["WEB"]}],"lineage":{"upstream":[],"downstream":["DLA-3350-1","USN-6065-1"],"duplicates":[],"related":["USN-6065-1"]},"timeline":[{"kind":"published","date":"2021-05-28T00:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T23:50:43.024Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T21:10:59.123Z","stale":false,"partial":false}}