{"schemaVersion":3,"id":"CVE-2021-24964","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The LiteSpeed Cache WordPress plugin before 4.4.4 does not properly verify that requests are coming from QUIC.cloud servers, allowing attackers to make requests to certain endpoints by using a specific X-Forwarded-For header value. In addition, one of the endpoint could be used to set CSS code if a setting is enabled, which will then be output in some pages without being sanitised and escaped. Combining those two issues, an unauthenticated attacker could put Cross-Site Scripting payloads in pages visited by users.","dates":{"published":"2022-01-03T12:49:08.000Z","modified":"2025-05-22T18:39:45.298Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"wordfence","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":2.6,"severity":"low","vector":"AV:N/AC:H/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"wordfence","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01216,"percentile":0.68147,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.01216},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01216,"percentile":0.68147}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01216,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01216,"percentile":0.68147}]},"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":[{"id":"REF_721DC04F4979D5C9","name":"Exploit Reference (wpscan.com)","source":"reference","url":"https://wpscan.com/vulnerability/e9966b3e-2eb9-4d70-8c18-6a829b4827cc","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","description":"The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/79.html"}],"affected":[{"vendor":"litespeedtech","product":"litespeed_cache","name":"litespeed cache","label":"litespeed_cache","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.4.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.4","eol":null,"hubHref":"/vendor/litespeedtech/litespeed_cache"},{"vendor":"unknown","product":"litespeed cache","name":"LiteSpeed Cache","label":"litespeed cache","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.4.4, < 4.4.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.4.4, < 4.4.4","eol":null,"hubHref":"/vendor/unknown/litespeed_cache"},{"vendor":"wordpress","product":"litespeed-cache","name":"LiteSpeed Cache","label":"litespeed-cache","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0.15, ≤ 4.4.3 (fixed in 4.4.4)","noFixRecorded":false,"fixedIn":"4.4.4"}],"versionsText":"≥ 1.0.15, ≤ 4.4.3 (fixed in 4.4.4)","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://wpscan.com/vulnerability/e9966b3e-2eb9-4d70-8c18-6a829b4827cc","label":"wpscan.com/vulnerability/e9966b3e-2eb9-4d70-8c18-6a829b4827cc","hostname":"wpscan.com","tags":["X Refsource MISC","Exploit","Third Party Advisory"]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/a82bffab-77c3-48e8-af84-39709bf0353b","label":"www.wordfence.com/threat-intel/vulnerabilities/id/a82bffab-77c3-48e8-af84-39709bf0353b","hostname":"www.wordfence.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2022-01-03T12:49:08.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-05-22T18:39:45.298Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":36,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T21:05:38.147Z","stale":false,"partial":false}}