Stack-based buffer overflow in Cisco Systems, Inc products - CVE-2021-1573
Published: October 28, 2021 / Updated: October 28, 2021
Vulnerability identifier: #VU57755
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-2021-1573
CWE-ID: CWE-121
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 HTTP requests. A remote unauthenticated attacker can send a specially crafted HTTP request to exposed SSL VPN web interface, trigger stack-based buffer overflow 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-2021-1573
Install updates from vendor's website.
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.4.0.13, 6.6.5, 6.7.0.1, 6.7.0.3, 7.0.1
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.26, 9.14.3, 9.15.1.17, 9.16.1.28
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.8.4.40, 9.12.4.26, 9.14.3, 9.15.1.17, 9.16.1.28