Buffer overflow in Cisco Systems, Inc products - CVE-2021-40117
Published: October 28, 2021
Vulnerability identifier: #VU57758
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-2021-40117
CWE-ID: CWE-119
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 a boundary error when processing SSL/TLS packets in SSL VPN interface. A remote attacker can send a specially crafted HTTPS request, trigger memory corruption and perform a denial of service (DoS) attack.
Affected software
ASA 5500-X Series Firewalls
Cisco Secure Firewall Threat Defense (FTD)
Cisco Secure Firewall Adaptive Security Appliance (ASA)
Cisco Secure Firewall Threat Defense (FTD)
Cisco Secure Firewall Adaptive Security Appliance (ASA)
How to mitigate CVE-2021-40117
Install updates from vendor's website.
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 6.2.3.17, 6.4.0.13, 6.6.5, 6.7.0.3
Cisco Secure Firewall Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.26, 9.14.3.9, 9.15.1.17
Cisco Secure Firewall Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.26, 9.14.3.9, 9.15.1.17