Resource exhaustion in Cisco Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2022-20760
Published: April 27, 2022
Vulnerability identifier: #VU62668
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-20760
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper management of internal resources in the DNS inspection handler. A remote attacker can send specially crafted DNS requests to the affected device, trigger resource exhaustion and perform a denial of service (DoS) attack.
Affected software
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Adaptive Security Appliance (ASA)
How to mitigate CVE-2022-20760
Install updates from vendor's website.
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.4.0.15, 6.6.5.2, 6.7.0.4, 7.0.2, 7.1.0.1
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.12.4.38, 9.14.4, 9.15.1.21, 9.16.2.14, 9.17.1.7
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.12.4.38, 9.14.4, 9.15.1.21, 9.16.2.14, 9.17.1.7