CVE Watch—

CVE-2024-20353

Cisco ASA and FTD Denial of Service Vulnerability

CVSS

—

No CVSS

EPSS

70.7%

p99

KEV

YES

Apr 24, 2024

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

63.3%EPSS · 30 days70.7%

2026-06-302026-07-16

KEV catalog record

Product

Cisco / Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

Vulnerability

Cisco ASA and FTD Denial of Service Vulnerability

Added to KEV

Apr 24, 2024

Remediate by

May 1, 2024

Known ransomware use

Summary 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.

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

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