Use-after-free in Cisco Systems, Inc products - CVE-2021-40125
Published: October 28, 2021
Vulnerability identifier: #VU57759
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-40125
CWE-ID: CWE-416
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 use-after-free error in the Internet Key Exchange Version 2 (IKEv2) implementation. A remote authenticated user can send specially crafted authenticated IKEv2 messages to the affected system, trigger a use-after-free error and perform a denial of service (DoS) attack.
Affected software
ASA 5500-X Series Firewalls
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
How to mitigate CVE-2021-40125
Install updates from vendor's website.
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.30, 9.14.3.9, 9.15.1.17, 9.16.2
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.30, 9.14.3.9, 9.15.1.17, 9.16.2