What’s Vulnerable › Vulnerabilities

CVE-2021-28116

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 12.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-09 · updated 2026-06-17
• Weakness: CWE-125

Description

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.

Affected products

• Debian Linux: 10.0, 11.0
• Fedoraproject Fedora: 33, 34
• Squid: through 4.14; from 5.0 through 5.0.5

References

• http://www.openwall.com/lists/oss-security/2021/10/04/1
• http://www.squid-cache.org/Versions/
• https://github.com/squid-cache/squid/security/advisories/GHSA-rgf3-9v3p-qp82
• 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/202105-14
• https://www.debian.org/security/2022/dsa-5171
• https://www.zerodayinitiative.com/advisories/ZDI-21-157/
• http://www.openwall.com/lists/oss-security/2021/10/04/1
• http://www.squid-cache.org/Versions/
• https://github.com/squid-cache/squid/security/advisories/GHSA-rgf3-9v3p-qp82
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/

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