CVE-2024-20353

HIGH CISA KEV

CVSS v3

8.6

HIGH

EPSS Score

—

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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 devic

CISA Known Exploited Vulnerability

Date Added: 4/24/2024
Patch Due Date: 5/1/2024
Required Action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Technical Details

CVSS v3 Vector: 3.1
Published: 4/24/2024
Last Modified: 10/28/2025
CERT-FR Advisory: CERTFR-2024-ALE-007
CERT-FR Link: CERTFR-2024-ALE-007

Frequently Asked Questions

What is CVE-2024-20353?

Is CVE-2024-20353 actively exploited?

Yes. CVE-2024-20353 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 5/1/2024.

What is the CVSS score for CVE-2024-20353?

CVE-2024-20353 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string 3.1.

Is CVE-2024-20353 affecting your environment?

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