CVE-2015-4321

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-08-20 · updated 2026-06-17
Weakness: CWE-20

Description

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 ASA Software: 9.3(1.50), 9.3(2.100), 9.3(3), 9.4(1)

References

http://tools.cisco.com/security/center/viewAlert.x?alertId=40440
http://www.securitytracker.com/id/1033265
http://tools.cisco.com/security/center/viewAlert.x?alertId=40440
http://www.securitytracker.com/id/1033265

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