Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Access Control Bypass Vulnerability

Summary

A vulnerability in the implementation of access control rules for loopback interfaces in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should have been blocked to a loopback interface. This vulnerability is due to improper enforcement of access control rules for loopback interfaces. An attacker could exploit this vulnerability by sending traffic to a loopback interface on an affected device. A successful exploit could allow the attacker to bypass configured access control rules and send traffic that should have been blocked to a loopback interface on the device.

Timeline

1. Aug 14, 2025, 4:28 PM UTCCVE published
2. Aug 14, 2025, 8:44 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Aug 14, 2025, 8:44 PM UTCRecord last updated

Affected versions

• Cisco Cisco Adaptive Security Appliance (ASA) Software

  9.18.2, 9.18.2.5, 9.18.2.7, 9.19.1, 9.18.2.8, 9.18.3, 9.19.1.5, 9.19.1.9, 9.18.3.39, 9.19.1.12, 9.18.3.46, 9.19.1.18, 9.18.3.53, 9.18.3.55, 9.18.3.56, 9.20.1, 9.19.1.22, 9.18.4, 9.20.1.5, 9.18.4.5, 9.19.1.24, 9.18.4.8, 9.20.2, 9.19.1.27, 9.18.4.22, 9.20.2.10, 9.19.1.28, 9.18.4.24, 9.20.2.21, 9.19.1.31, and 14 more

• Cisco Cisco Firepower Threat Defense Software

  7.3.0, 7.3.1, 7.3.1.1, 7.4.0, 7.4.1, 7.4.1.1, 7.3.1.2, 7.6.0, 7.4.2, 7.4.2.1

References 1