CVE-2019-12673: Cisco Adaptive Security Appliance

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

A vulnerability in the FTP inspection engine of Cisco Adaptive Security (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of FTP data. An attacker could exploit this vulnerability by sending malicious FTP traffic through an affected device. A successful exploit could allow the attacker to cause a DoS condition on the affected 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 9.8.4.10 (fixed in 9.8.4.10); from 9.9, before 9.9.2.56 (fixed in 9.9.2.56); from 9.10, before 9.10.1.30 (fixed in 9.10.1.30); from 9.12, before 9.12.2.5 (fixed in 9.12.2.5)
• Cisco Secure Firewall Threat Defense: before 6.3.0.5 (fixed in 6.3.0.5); from 6.4.0, before 6.4.0.4 (fixed in 6.4.0.4)

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