CVE-2021-28662

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.

• CWE-116

• http://seclists.org/fulldisclosure/2023/Oct/14Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2023/10/11/3Mailing List, Third Party Advisory
• http://www.squid-cache.org/Versions/v6/changesets/squid-6-051824924c709bd6162a378f746fb859454c674e.patchPatch, Vendor Advisory
• https://github.com/squid-cache/squid/commit/051824924c709bd6162a378f746fb859454c674ePatch, Third Party Advisory
• https://github.com/squid-cache/squid/security/advisories/GHSA-jjq6-mh2h-g39hPatch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
• https://www.debian.org/security/2021/dsa-4924Third Party Advisory
• http://seclists.org/fulldisclosure/2023/Oct/14Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2023/10/11/3Mailing List, Third Party Advisory
• http://www.squid-cache.org/Versions/v6/changesets/squid-6-051824924c709bd6162a378f746fb859454c674e.patchPatch, Vendor Advisory
• https://github.com/squid-cache/squid/commit/051824924c709bd6162a378f746fb859454c674ePatch, Third Party Advisory
• https://github.com/squid-cache/squid/security/advisories/GHSA-jjq6-mh2h-g39hPatch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
• https://www.debian.org/security/2021/dsa-4924Third Party Advisory

Published

May 27, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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