CVE-2015-4321 Security feature bypass in n/a
Remote attackers can bypass Unicast Reverse Path Forwarding validation on Cisco ASA devices by sending spoofed packets, undermining anti-spoofing protections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2015-4321?
CVE-2015-4321 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, published on 20 Aug 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-20
Which versions are affected by CVE-2015-4321?
It affects 1 product.
Products include Cisco Adaptive Security Appliance Software.
How do I fix CVE-2015-4321?
No fix has been published for CVE-2015-4321 yet. Limit exposure of the affected software until one is available.
Is CVE-2015-4321 being exploited?
There is no known exploitation of CVE-2015-4321 in the wild and no public exploit code.
Other vulnerabilities in Cisco Adaptive Security Appliance Software
- CVE-2025-20333 Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow
- CVE-2016-6366 Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow
- CVE-2026-20349 Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection
- CVE-2024-20353 Cisco ASA and FTD Denial of Service
- CVE-2016-6367 Cisco Adaptive Security Appliance (ASA) CLI Remote Code Execution
All Cisco Adaptive Security Appliance Software vulnerabilities
Sources
Also known as GHSA-f88v-743w-mgc8.