Improperly implemented security check for standard in Cisco Secure Firewall Adaptive Security Appliance (ASA) and Cisco Secure Firewall Threat Defense (FTD) - CVE-2021-34791
Published: October 29, 2021
Vulnerability identifier: #VU57797
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34791
CWE-ID: CWE-358
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to insufficient traffic validation within the File Transfer Protocol (FTP) Application Level Gateway (ALG) for the Network Address Translation (NAT) feature. A remote attacker can send a specially crafted FTP traffic, open unauthorized connections to the remote host and undertake actions leveraging that host.
Affected software
Cisco Secure Firewall Adaptive Security Appliance (ASA)
Cisco Secure Firewall Threat Defense (FTD)
Cisco Secure Firewall Threat Defense (FTD)
How to mitigate CVE-2021-34791
Install updates from vendor's website.
Cisco Secure Firewall Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.18, 9.14.2.15, 9.15.1.15
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 6.4.0.12, 6.6.5, 6.7.0.2
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 6.4.0.12, 6.6.5, 6.7.0.2