Cisco Secure Adaptive Security Appliance Software and Secure Firewall Threat Defense Software EIGRP Denial of Service Vulnerability

Summary

A vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper resource management when handling EIGRP update messages. An attacker could exploit this vulnerability by sending crafted EIGRP updates at a high rate to an affected device. A successful exploit could allow the attacker to trigger a memory leak that will eventually cause the affected device to reload unexpectedly.

Timeline

1. Sep 16, 2026, 8:12 PM UTCCVE published
2. Sep 17, 2026, 2:52 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Sep 18, 2026, 7:08 PM UTCRecord last updated

Affected versions

• Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

  9.19.1, 9.19.1.5, 9.19.1.9, 9.19.1.12, 9.19.1.18, 9.20.1, 9.19.1.22, 9.20.1.5, 9.19.1.24, 9.20.2, 9.19.1.27, 9.20.2.10, 9.19.1.28, 9.20.2.21, 9.19.1.31, 9.20.2.22, 9.20.3, 9.23.1, 9.22.1.1, 9.20.3.4, 9.20.3.7, 9.19.1.37, 9.20.3.9, 9.19.1.38, 9.22.1.3, 9.20.3.10, 9.22.1.2, 9.20.3.13, 9.22.1.6, 9.22.2, and 34 more

• Cisco Cisco Secure Firewall Threat Defense (FTD) 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, 7.7.0, 7.4.2.2, 7.6.1, 7.4.2.3, 7.6.2, 7.7.10, 7.7.11, 7.6.2.1, 7.7.10.1, 7.4.2.4, 7.4.3, 7.6.4, 10.0.0, 7.4.4, 7.4.7

References 1