CVE-2015-4321: Cisco Adaptive Security Appliance Software

Medium severity, CVSS 5.0. EPSS: 1.7% chance of exploitation in the next 30 days.

The Unicast Reverse Path Forwarding (uRPF) implementation in Cisco Adaptive Security Appliance (ASA) Software 9.3(1.50), 9.3(2.100), 9.3(3), and 9.4(1) mishandles cases where an IP address belongs to an internal interface but is also in the ASA routing table, which allows remote attackers to bypass uRPF validation via spoofed packets, aka Bug ID CSCuv60724.

Affected products

• Cisco Adaptive Security Appliance Software: version 9.3(1.50) only; version 9.3(2.100) only; version 9.3(3) only; version 9.4(1) only

Published 2015-08-20. Last modified 2026-06-17.