{"id":"CVE-2021-31806","aliases":["CVE-2021-31807","CVE-2021-31808","GHSA-pxwq-f3qr-w2xf"],"url":"https://o3.security/vulnerability/CVE-2021-31806","summary":null,"details":"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.","published":"2021-05-27T13:15:08.270Z","modified":"2026-07-08T06:50:07.178850323Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.95785,"percentile":0.99869,"asOf":"2026-09-13"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[],"fix":null,"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://lists.debian.org/debian-lts-announce/2021/06/msg00014.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210716-0007/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4924"},{"type":"FIX","url":"http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patch"},{"type":"FIX","url":"https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:50:07.178850323Z"}}