CVE-2021-33620
MEDIUMSquid < 4.15 and 5.x < 5.0.6 - Denial of Service via HTTP Response Header
Title source: llmDescription
Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.
References (8)
Core 8
Core References
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html
Mailing List, Third Party Advisory mailing-list
http://www.openwall.com/lists/oss-security/2023/10/11/3
Mailing List, Third Party Advisory mailing-list
http://seclists.org/fulldisclosure/2023/Oct/14
Mailing List, Patch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-1e05a85bd28c22c9ca5d3ac9f5e86d6269ec0a8c.patch
Mailing List, Patch, Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-8af775ed98bfd610f9ce762fe177e01b2675588c.patch
Patch, Third Party Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-572g-rvwr-6c7f
Scores
CVSS v3
6.5
EPSS
0.7958
EPSS Percentile
99.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-20
Status
published
Products (4)
debian/debian_linux
9.0
fedoraproject/fedora
33
fedoraproject/fedora
34
squid-cache/squid
< 4.15
Published
May 28, 2021
Tracked Since
Feb 18, 2026