CVE-2022-20745: Cisco Adaptive Security Appliance Software

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

A vulnerability in the web services interface for remote access VPN features 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. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a crafted HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Affected products

• Cisco Adaptive Security Appliance Software: before 9.12.4.38 (fixed in 9.12.4.38); from 9.13.0, before 9.14.4 (fixed in 9.14.4); from 9.15.0, before 9.15.1.21 (fixed in 9.15.1.21); from 9.16.0, before 9.16.2.14 (fixed in 9.16.2.14); from 9.17.0, before 9.17.1.7 (fixed in 9.17.1.7)
• Cisco Secure Firewall Threat Defense: before 6.4.0.15 (fixed in 6.4.0.15); from 6.5.0, before 6.6.5.2 (fixed in 6.6.5.2); from 7.0.0, before 7.0.2 (fixed in 7.0.2); version 7.1.0 only

Published 2022-05-03. Last modified 2026-08-11.