Input validation error in Cisco Systems, Inc products - CVE-2021-34704
Published: October 28, 2021
Vulnerability identifier: #VU57756
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-2021-34704
CWE-ID: CWE-20
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 insufficient validation of user-supplied input when processing HTTP requests sent to the SSL VPN interface. A remote attacker can send a specially crafted config-request HTTP request 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-2021-34704
Install updates from vendor's website.
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.7.0.3, 7.0.1
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.15.1.17, 9.16.2
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.15.1.17, 9.16.2