{"cve_id":"CVE-2021-31806","published":"2021-05-27T13:15:08.270000+00:00","last_modified":"2026-06-17T03:52:16.073000+00:00","vuln_status":"Modified","description":"An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","base_score":6.5,"base_severity":"MEDIUM","attack_vector":"NETWORK","privileges_req":"LOW","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"NONE","impact_i":"NONE","impact_a":"HIGH","cwe_ids":["CWE-116"],"in_kev":false,"kev_date_added":null,"kev_ransomware":false,"epss_score":0.95333,"epss_percentile":0.99866,"cap_rule_version":"0.1.1","stage":"IMPACT","req_access":"USER","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["DOS"],"terminal":true,"cap_confidence":"high","ingested_at":"2026-09-18T09:41:33.892865+00:00","first_seen":"2021-05-27T13:15:08.270000+00:00","kev_first_seen":null,"novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["debian","fedoraproject","netapp","squid-cache"],"products":["cloud_manager","debian_linux","fedora","squid"],"affected":[{"vendor":"debian","product":"debian_linux","ranges":["10.0","9.0"]},{"vendor":"fedoraproject","product":"fedora","ranges":["33","34"]},{"vendor":"netapp","product":"cloud_manager","ranges":["all versions"]},{"vendor":"squid-cache","product":"squid","ranges":["< 4.15","≥ 5.0 and < 5.0.6"]}]}