{"schemaVersion":3,"id":"USN-4981-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"squid, squid3 vulnerabilities\n\nJoshua Rogers discovered that Squid incorrectly handled requests with the\nurn: scheme. A remote attacker could possibly use this issue to cause\nSquid to consume resources, leading to a denial of service.\n(CVE-2021-28651)\n\nJoshua Rogers discovered that Squid incorrectly handled requests to the\nCache Manager API. A remote attacker with access privileges could possibly\nuse this issue to cause Squid to consume resources, leading to a denial of\nservice. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 20.10,\nand Ubuntu 21.04. (CVE-2021-28652)\n\nJoshua Rogers discovered that Squid incorrectly handled certain response\nheaders. A remote attacker could possibly use this issue to cause Squid to\ncrash, resulting in a denial of service. This issue was only affected\nUbuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-28662)\n\nJoshua Rogers discovered that Squid incorrectly handled range request\nprocessing. A remote attacker could possibly use this issue to cause Squid\nto crash, resulting in a denial of service. (CVE-2021-31806,\nCVE-2021-31807, CVE-2021-31808)\n\nJoshua Rogers discovered that Squid incorrectly handled certain HTTP\nresponses. A remote attacker could possibly use this issue to cause Squid\nto crash, resulting in a denial of service. (CVE-2021-33620)","dates":{"published":"2021-06-03T16:24:27.000Z","modified":"2026-04-27T19:02:52.083Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"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":"ubuntu","product":"squid","name":"squid","label":"squid","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/squid","purlType":"deb","versions":[{"text":"< 4.10-1ubuntu1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.10-1ubuntu1.4","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"squid3","name":"squid3","label":"squid3","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/squid3","purlType":"deb","versions":[{"text":"< 3.5.27-1ubuntu1.11","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.5.27-1ubuntu1.11","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4981-1","label":"ubuntu.com/security/notices/USN-4981-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-28651","label":"ubuntu.com/security/CVE-2021-28651","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-28652","label":"ubuntu.com/security/CVE-2021-28652","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-28662","label":"ubuntu.com/security/CVE-2021-28662","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-31806","label":"ubuntu.com/security/CVE-2021-31806","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-31807","label":"ubuntu.com/security/CVE-2021-31807","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-31808","label":"ubuntu.com/security/CVE-2021-31808","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-33620","label":"ubuntu.com/security/CVE-2021-33620","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2021-28651","CVE-2021-28652","CVE-2021-28662","CVE-2021-31806","CVE-2021-31807","CVE-2021-31808","CVE-2021-33620"],"downstream":[],"duplicates":[],"related":["CVE-2021-28651","CVE-2021-28652","CVE-2021-28662","CVE-2021-31806","CVE-2021-31807","CVE-2021-31808","CVE-2021-33620"]},"timeline":[{"kind":"published","date":"2021-06-03T16:24:27.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-27T19:02:52.083Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T16:43:34.778Z","stale":false,"partial":false}}