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Servers and applications

CVE-2015-4321

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.

Severity
Medium 5.0
Published
20 Aug 2015
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1.7% in the next 30 daysHigher than 78% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Read some data
CVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Sources
NVD

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • Version 9.3(1.50)
  • Version 9.3(2.100)
  • Version 9.3(3)
  • Version 9.4(1)

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2015-4321
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2015-4321