Heap-based buffer overflow in Cisco Adaptive Security Appliance (ASA) - CVE-2022-20737
Published: April 27, 2022
Vulnerability identifier: #VU62665
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-20737
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when parsing specific HTTP authentication messages in the handler for HTTP authentication for resources accessed through the Clientless SSL VPN portal. A remote authenticated user can send specially crafted traffic to the device acting as a VPN Gateway, trigger a heap-based buffer overflow and gain access to sensitive information or perform a denial of service (DoS) attack.
Affected software
Cisco Adaptive Security Appliance (ASA)
How to mitigate CVE-2022-20737
Install updates from vendor's website.
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