CVE-2021-28116

Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.

• CWE-125

• http://www.openwall.com/lists/oss-security/2021/10/04/1Mailing List, Third Party Advisory
• http://www.squid-cache.org/Versions/Product, Vendor Advisory
• https://github.com/squid-cache/squid/security/advisories/GHSA-rgf3-9v3p-qp82Broken Link
• 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://security.gentoo.org/glsa/202105-14Third Party Advisory
• https://www.debian.org/security/2022/dsa-5171Third Party Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-157/Third Party Advisory, VDB Entry
• http://www.openwall.com/lists/oss-security/2021/10/04/1Mailing List, Third Party Advisory
• http://www.squid-cache.org/Versions/Product, Vendor Advisory
• https://github.com/squid-cache/squid/security/advisories/GHSA-rgf3-9v3p-qp82Broken Link
• 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://security.gentoo.org/glsa/202105-14Third Party Advisory
• https://www.debian.org/security/2022/dsa-5171Third Party Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-157/Third Party Advisory, VDB Entry

Published

Mar 9, 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.
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