Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
YES - ON THE CISA KEV LIST
CVE-2024-20353
Cisco ASA and FTD Denial of Service Vulnerability
overdue since 2024-05-01
Cisco: 103 entries (5.8% of all KEV entries are from this vendor); 21 added in 2026.
BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.
Your BOD 26-04 window (SSVC tier helper)
Your remediation window ends:
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 (CISA)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Notes
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2; https://nvd.nist.gov/vuln/detail/CVE-2024-20353
References
Other KEV entries for this vendor: Cisco
- CVE-2026-20320 - BroadWorks (2026-11-10)
- CVE-2026-76418 - Secure Firewall ASA Software and Cisco Secure FTD Software (2026-10-29)
- CVE-2026-76519 - Secure Email Gateway (2026-10-14)
- CVE-2026-76504 - Catalyst SD-WAN Manager (2026-09-30)
- CVE-2026-76460 - Identity Services Engine (2026-09-16)
- CVE-2026-76461 - Secure Email Gateway (2026-09-14)
- CVE-2026-20079 - Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management (2026-09-09)
- CVE-2026-20349 - Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) (2026-08-11)
Go deeper
KEV deadlines are a governance problem as much as a patching one. TrebSec's AI governance packs help small teams document, assign, and evidence exactly this work.
AI Governance Policy Pack - $79 AI Vendor Workbook - $49 Both packs bundled - $99