CVE-2020-8449: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 8.3% chance of exploitation in the next 30 days.

An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.10 only
• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 30 only; version 31 only
• Opensuse Leap: version 15.1 only
• Squid-Cache Squid: before 4.10 (fixed in 4.10)

Published 2020-02-04. Last modified 2026-06-17.