{"id":"CVE-2021-28662","details":"An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in benign network traffic.","modified":"2026-04-16T04:32:30.382774755Z","published":"2021-05-27T12:15:08.263Z","related":["ALSA-2021:4292","GHSA-jjq6-mh2h-g39h","SUSE-SU-2021:1838-1","SUSE-SU-2021:1961-1","openSUSE-SU-2021:0879-1","openSUSE-SU-2021:1961-1","openSUSE-SU-2024:11403-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/"},{"type":"ADVISORY","url":"http://seclists.org/fulldisclosure/2023/Oct/14"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2023/10/11/3"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4924"},{"type":"FIX","url":"http://www.squid-cache.org/Versions/v6/changesets/squid-6-051824924c709bd6162a378f746fb859454c674e.patch"},{"type":"FIX","url":"https://github.com/squid-cache/squid/commit/051824924c709bd6162a378f746fb859454c674e"},{"type":"FIX","url":"https://github.com/squid-cache/squid/security/advisories/GHSA-jjq6-mh2h-g39h"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/squid-cache/squid","events":[{"introduced":"1243ec712bf76c549ba7f48fcdc30d98ce550449"},{"fixed":"648729b05673c6166c5d91c6ee4cda30cc164839"},{"introduced":"0"},{"fixed":"1521895e24671463bf590cabcdbd2acf637ed2c1"},{"introduced":"0"},{"last_affected":"0f67e2aac4a27d0c5ffbfa1dcd89d8abbc7175a7"},{"fixed":"051824924c709bd6162a378f746fb859454c674e"}],"database_specific":{"versions":[{"introduced":"4.0.1"},{"fixed":"4.15"},{"introduced":"5.0"},{"fixed":"5.0.6"},{"introduced":"0"},{"last_affected":"33"}]}}],"versions":["M-staged-PR161","M-staged-PR164","M-staged-PR170","M-staged-PR176","M-staged-PR179","M-staged-PR181","M-staged-PR182","M-staged-PR186","M-staged-PR189","M-staged-PR193","M-staged-PR195","M-staged-PR196","M-staged-PR198","M-staged-PR199","M-staged-PR200","M-staged-PR202","M-staged-PR206","M-staged-PR208","M-staged-PR209","M-staged-PR210","M-staged-PR218","M-staged-PR220","M-staged-PR221","M-staged-PR225","M-staged-PR227","M-staged-PR229","M-staged-PR230","M-staged-PR235","M-staged-PR237","M-staged-PR238","M-staged-PR239","M-staged-PR241","M-staged-PR242","M-staged-PR252","M-staged-PR255","M-staged-PR258","M-staged-PR264","M-staged-PR266","M-staged-PR267","M-staged-PR268","M-staged-PR274","M-staged-PR276","M-staged-PR293","M-staged-PR294","M-staged-PR295","M-staged-PR299","M-staged-PR306","M-staged-PR314","M-staged-PR319","M-staged-PR330","M-staged-PR342","M-staged-PR345","M-staged-PR348","M-staged-PR351","M-staged-PR359","M-staged-PR364","M-staged-PR365","M-staged-PR366","M-staged-PR370","M-staged-PR372","M-staged-PR373","M-staged-PR375","M-staged-PR376","SQUID_3_5_27","SQUID_4_0_1","SQUID_4_0_10","SQUID_4_0_11","SQUID_4_0_12","SQUID_4_0_13","SQUID_4_0_14","SQUID_4_0_15","SQUID_4_0_16","SQUID_4_0_17","SQUID_4_0_18","SQUID_4_0_19","SQUID_4_0_2","SQUID_4_0_20","SQUID_4_0_21","SQUID_4_0_22","SQUID_4_0_23","SQUID_4_0_24","SQUID_4_0_25","SQUID_4_0_3","SQUID_4_0_4","SQUID_4_0_5","SQUID_4_0_6","SQUID_4_0_7","SQUID_4_0_8","SQUID_4_0_9","SQUID_4_1","SQUID_4_10","SQUID_4_11","SQUID_4_12","SQUID_4_13","SQUID_4_14","SQUID_4_2","SQUID_4_3","SQUID_4_4","SQUID_4_5","SQUID_4_6","SQUID_4_7","SQUID_4_8","SQUID_4_9","SQUID_5_0_1","SQUID_5_0_2","SQUID_5_0_3","SQUID_5_0_4","SQUID_5_0_5"],"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"34"}]}],"vanir_signatures_modified":"2026-04-11T17:12:16Z","vanir_signatures":[{"signature_type":"Line","digest":{"line_hashes":["246787021619791419152269128153398552627","137540088876487517479355767659710642705","2037448173086037427154046699180625686","111963318781500401476263553951823657637"],"threshold":0.9},"target":{"file":"src/http/RegisteredHeaders.cc"},"signature_version":"v1","deprecated":false,"id":"CVE-2021-28662-ac67f9e9","source":"https://github.com/squid-cache/squid/commit/051824924c709bd6162a378f746fb859454c674e"},{"signature_type":"Function","digest":{"function_hash":"213594514490356346423760141520931754203","length":211},"target":{"file":"src/http/RegisteredHeaders.cc","function":"HeaderLookupTable_t::lookup"},"signature_version":"v1","deprecated":false,"id":"CVE-2021-28662-b5ea6bf5","source":"https://github.com/squid-cache/squid/commit/051824924c709bd6162a378f746fb859454c674e"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28662.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}