CVE-2020-3254: Cisco Adaptive Security Appliance Software

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the Media Gateway Control Protocol (MGCP) inspection feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerabilities are due to inefficient memory management. An attacker could exploit these vulnerabilities by sending crafted MGCP packets through an affected device. An exploit could allow the attacker to cause memory exhaustion resulting in a restart of an affected device, causing a DoS condition for traffic traversing the device.

Affected products

• Cisco Adaptive Security Appliance Software: from 9.6, before 9.6.4.34 (fixed in 9.6.4.34); from 9.8, before 9.8.4.7 (fixed in 9.8.4.7); from 9.9, before 9.9.2.66 (fixed in 9.9.2.66); 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 ASA 5505 Firmware: version 9.10(1.3) only
• Cisco ASA 5510 Firmware: version 9.10(1.3) only
• Cisco ASA 5512-X Firmware: version 9.10(1.3) only
• Cisco ASA 5515-X Firmware: version 9.10(1.3) only
• Cisco ASA 5520 Firmware: version 9.10(1.3) only
• Cisco ASA 5525-X Firmware: version 9.10(1.3) only
• Cisco ASA 5540 Firmware: version 9.10(1.3) only
• Cisco ASA 5545-X Firmware: version 9.10(1.3) only
• Cisco ASA 5550 Firmware: version 9.10(1.3) only
• Cisco ASA 5555-X Firmware: version 9.10(1.3) only
• Cisco ASA 5580 Firmware: version 9.10(1.3) only
• Cisco ASA 5585-X Firmware: version 9.10(1.3) only
• Cisco Secure Firewall Threat Defense: from 6.2.3, before 6.2.3.16 (fixed in 6.2.3.16); from 6.3.0, before 6.3.0.6 (fixed in 6.3.0.6); from 6.4.0, before 6.4.0.4 (fixed in 6.4.0.4)

Published 2020-05-06. Last modified 2026-08-11.