Medium severity6.5NVD Advisory· Published May 28, 2021· Updated Jun 17, 2026
CVE-2021-33620
CVE-2021-33620
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
33- osv-coords27 versionspkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/opensuse/squid&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/squid&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/opensuse/squid&distro=openSUSE%20Tumbleweedpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-BCLpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP2pkg:rpm/suse/squid&distro=SUSE%20Manager%20Proxy%204.1pkg:rpm/suse/squid&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.1pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/squid&distro=SUSE%20Enterprise%20Storage%207pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-ESPOSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-LTSSpkg:rpm/suse/squid&distro=SUSE%20Manager%20Server%204.1pkg:rpm/almalinux/libecappkg:rpm/almalinux/libecap-develpkg:rpm/almalinux/squid
< 4.17-150000.5.32.1+ 26 more
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 5.4.1-2.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-4.24.1
- (no CPE)range: < 4.17-4.24.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 4.17-150000.5.32.1
- (no CPE)range: < 1.0.1-2.module_el8.6.0+2741+01592ae8
- (no CPE)range: < 1.0.1-2.module_el8.6.0+2741+01592ae8
- (no CPE)range: < 7:4.15-3.module_el8.6.0+3010+383bc947.1
- Squid/Squiddescription
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
8- www.squid-cache.org/Versions/v4/changesets/squid-4-1e05a85bd28c22c9ca5d3ac9f5e86d6269ec0a8c.patchnvdMailing ListPatchVendor Advisory
- www.squid-cache.org/Versions/v5/changesets/squid-5-8af775ed98bfd610f9ce762fe177e01b2675588c.patchnvdMailing ListPatchVendor Advisory
- github.com/squid-cache/squid/security/advisories/GHSA-572g-rvwr-6c7fnvdPatchThird Party Advisory
- seclists.org/fulldisclosure/2023/Oct/14nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/10/11/3nvdMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/06/msg00014.htmlnvdMailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/nvd
News mentions
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