CVE-2024-20353
Cisco ASA and FTD Denial of Service Vulnerability
What is affected
| Vendor | Cisco |
|---|---|
| Product | Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) |
| Weakness | CWE-835 |
The 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.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies were required to act by 1 May 2024 under BOD 22-01. The deadline is a compliance date, not a measure of severity — it says nothing about how dangerous the flaw is to anyone else.
Where this comes from
Every field on this page is taken from the CISA Known Exploited Vulnerabilities catalog, last synced 12 Nov 2026, 00:29. Nothing here is our own assessment. For the technical scoring, see the NVD record below.
More from Cisco
Cisco BroadWorks
Cisco BroadWorks Improper Restriction of XML External Entity Reference Vulnerability
CVE-2026-76418Cisco Secure Firewall ASA Software and Cisco Secure FTD Software
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
CVE-2026-76519Cisco Secure Email Gateway
Cisco Secure Email Gateway Relative Path Traversal Vulnerability
CVE-2026-76504Cisco Catalyst SD-WAN Manager
Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability