CVE-2013-2175: Canonical Ubuntu Linux

Medium severity, CVSS 5.0. EPSS: 3.6% chance of exploitation in the next 30 days.

HAProxy 1.4 before 1.4.24 and 1.5 before 1.5-dev19, when configured to use hdr_ip or other "hdr_*" functions with a negative occurrence count, allows remote attackers to cause a denial of service (negative array index usage and crash) via an HTTP header with a certain number of values, related to the MAX_HDR_HISTORY variable.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 12.10 only; version 13.04 only
• Debian Debian Linux: version 6.0 only
• Haproxy Haproxy: version 1.4 only; version 1.4.0 only; version 1.4.1 only; version 1.4.2 only; version 1.4.3 only; version 1.4.4 only; …
• Red Hat Enterprise Linux Load Balancer: version 6.0 only; version 6.4 only

Published 2013-08-19. Last modified 2026-06-16.