April 24, 2024 · Applied Cybernetics Group
CVE-2024-20353 — Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
Cisco ASA and FTD Denial of Service Vulnerability
- Added to KEV
2024-04-24- Federal due date
2024-05-01- Vendor
- Cisco
- Product
- Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
- EPSS
- 99.4th percentile (score 0.707, as of
2026-09-16) - NVD CVSS v3.1
- 8.6 (HIGH)
- Ransomware use
- Unknown
- ATT&CK
- T1037 , T1190 , T1608.001 , T1653 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2024-20353
CISA short description
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
NVD description
A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.