CVE-2019-12678: Cisco Adaptive Security Appliance

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

A vulnerability in the Session Initiation Protocol (SIP) inspection module of Cisco Adaptive Security Appliance (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 improper parsing of SIP messages. An attacker could exploit this vulnerability by sending a malicious SIP packet through an affected device. A successful exploit could allow the attacker to trigger an integer underflow, causing the software to try to read unmapped memory and resulting in a crash.

Affected products

• Cisco Adaptive Security Appliance: before 9.4.4.37 (fixed in 9.4.4.37)
• Cisco Adaptive Security Appliance Software: from 9.5, before 9.6.4.34 (fixed in 9.6.4.34); from 9.7, before 9.8.4.7 (fixed in 9.8.4.7); from 9.9, before 9.9.2.56 (fixed in 9.9.2.56); 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 6.2.3.15 (fixed in 6.2.3.15); from 6.3.0, 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.