CVE-2020-15049

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

• CWE-444

• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html
• http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patchPatch, Vendor Advisory
• http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.patchPatch, Vendor Advisory
• https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ7NFT6HDO7/
• https://security.netapp.com/advisory/ntap-20210312-0001/
• https://usn.ubuntu.com/4551-1/
• https://www.debian.org/security/2020/dsa-4732
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html
• http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patchPatch, Vendor Advisory
• http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.patchPatch, Vendor Advisory
• https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ7NFT6HDO7/
• https://security.netapp.com/advisory/ntap-20210312-0001/
• https://usn.ubuntu.com/4551-1/
• https://www.debian.org/security/2020/dsa-4732

Published

Jun 30, 2020

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.
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