CVE-2019-12676: Cisco Adaptive Security Appliance

High severity, CVSS 7.4. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability in the Open Shortest Path First (OSPF) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software improperly parses certain options in OSPF link-state advertisement (LSA) type 11 packets. An attacker could exploit this vulnerability by sending a crafted LSA type 11 OSPF packet to an affected device. A successful exploit could allow the attacker to cause a reload of the affected device, resulting in a DoS condition for client traffic that is traversing the device.

Affected products

• Cisco Adaptive Security Appliance: before 9.6.4.34 (fixed in 9.6.4.34)
• Cisco Adaptive Security Appliance Software: from 9.7, before 9.8.4.8 (fixed in 9.8.4.8); from 9.9, before 9.9.2.59 (fixed in 9.9.2.59); from 9.10, before 9.10.1.27 (fixed in 9.10.1.27); from 9.12, before 9.12.2.1 (fixed in 9.12.2.1)
• Cisco Secure Firewall Threat Defense: before 6.3.0.4 (fixed in 6.3.0.4); from 6.4.0, before 6.4.0.4 (fixed in 6.4.0.4)

Published 2019-10-02. Last modified 2026-08-11.