Buffer overflow in Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA) - CVE-2021-34783
Published: October 29, 2021
Vulnerability identifier: #VU57798
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-2021-34783
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 in the software-based SSL/TLS message handler. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.
Affected software
Cisco Secure Firewall Threat Defense (FTD)
Cisco Secure Firewall Adaptive Security Appliance (ASA)
Cisco Secure Firewall Adaptive Security Appliance (ASA)
How to mitigate CVE-2021-34783
Install updates from vendor's website.
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1
Cisco Secure Firewall Adaptive Security Appliance (ASA) - update to 9.16.2
Cisco Secure Firewall Adaptive Security Appliance (ASA) - update to 9.16.2