CVE-2021-28116: Debian Linux

Medium severity, CVSS 5.3. EPSS: 12.9% chance of exploitation in the next 30 days.

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 Debian Linux: version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 33 only; version 34 only
• Squid-Cache Squid: up to and including 4.14; from 5.0, up to and including 5.0.5

Published 2021-03-09. Last modified 2026-06-17.