CVE-2024-20353
Published: April 24, 2024
Official 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.
CISA KEV Advisory
Cisco ASA and FTD Denial of Service Vulnerability
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Risk Analysis
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) are vulnerable to an infinite loop condition, which can lead to a remote denial of service. This high-severity flaw has an EPSS score of 0.19536, indicating a significant likelihood of exploitation, and CISA has confirmed its active exploitation.
This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog. The flaw allows for remote denial of service.
Apply all available security updates for Cisco ASA and FTD to resolve the infinite loop vulnerability. Monitor network traffic for signs of denial of service attacks and implement rate limiting.
Technical Analysis
CVE-2024-20353 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2024-20353 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2024-20353 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1