CVE-2021-31807: Fedoraproject Fedora

Medium severity, CVSS 6.5. EPSS: 15.6% chance of exploitation in the next 30 days.

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.

Affected products

• Fedoraproject Fedora: version 33 only; version 34 only
• Netapp Cloud Manager: affected versions not specified
• Squid-Cache Squid: from 3.0, before 4.15 (fixed in 4.15); from 5.0, before 5.0.6 (fixed in 5.0.6); version 2.5.stable2 only; version 2.5.stable3 only; version 2.5.stable4 only; version 2.5.stable5 only; …

Published 2021-06-08. Last modified 2026-06-17.