CVEvulnerability

CVE-2024-20353

8.6 HIGH Known exploited Published 2024-04-24 Modified 2026-08-11 Official page ↗

CISA Known Exploited Vulnerability

Cisco ASA and FTD Denial of Service Vulnerability — Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.

Added to KEV: 2024-04-24
Remediation due: 2024-05-01
Ransomware use: Unknown
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

Status: Analyzed
Published: 2024-04-24
Last modified: 2026-08-11
Assigner: [email protected]
CVSS 3.1 ([email protected]): 8.6 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS 3.1 ([email protected]): 8.6 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weaknesses: CWE-835

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 device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

Affected configurations

• cisco adaptive security appliance software 9.8.1 • cisco adaptive security appliance software 9.8.1.5 • cisco adaptive security appliance software 9.8.1.7 • cisco adaptive security appliance software 9.8.2 • cisco adaptive security appliance software 9.8.2.8 • cisco adaptive security appliance software 9.8.2.14 • cisco adaptive security appliance software 9.8.2.15 • cisco adaptive security appliance software 9.8.2.17 • cisco adaptive security appliance software 9.8.2.20 • cisco adaptive security appliance software 9.8.2.24 • cisco adaptive security appliance software 9.8.2.26 • cisco adaptive security appliance software 9.8.2.28 • cisco adaptive security appliance software 9.8.2.33 • cisco adaptive security appliance software 9.8.2.35 • cisco adaptive security appliance software 9.8.2.38 • cisco adaptive security appliance software 9.8.3 • cisco adaptive security appliance software 9.8.3.8 • cisco adaptive security appliance software 9.8.3.11 • cisco adaptive security appliance software 9.8.3.14 • cisco adaptive security appliance software 9.8.3.16 • cisco adaptive security appliance software 9.8.3.18 • cisco adaptive security appliance software 9.8.3.21 • cisco adaptive security appliance software 9.8.3.26 • cisco adaptive security appliance software 9.8.3.29 • cisco adaptive security appliance software 9.8.4 • cisco adaptive security appliance software 9.8.4.3 • cisco adaptive security appliance software 9.8.4.7 • cisco adaptive security appliance software 9.8.4.8 • cisco adaptive security appliance software 9.8.4.10 • cisco adaptive security appliance software 9.8.4.12 • cisco adaptive security appliance software 9.8.4.15 • cisco adaptive security appliance software 9.8.4.17 • cisco adaptive security appliance software 9.8.4.20 • cisco adaptive security appliance software 9.8.4.22 • cisco adaptive security appliance software 9.8.4.25 • cisco adaptive security appliance software 9.8.4.26 • cisco adaptive security appliance software 9.8.4.29 • cisco adaptive security appliance software 9.8.4.32 • cisco adaptive security appliance software 9.8.4.33 • cisco adaptive security appliance software 9.8.4.34 • cisco adaptive security appliance software 9.8.4.35 • cisco adaptive security appliance software 9.8.4.39 • cisco adaptive security appliance software 9.8.4.40 • cisco adaptive security appliance software 9.8.4.41 • cisco adaptive security appliance software 9.8.4.43 • cisco adaptive security appliance software 9.8.4.44 • cisco adaptive security appliance software 9.8.4.45 • cisco adaptive security appliance software 9.8.4.46 • cisco adaptive security appliance software 9.8.4.48 • cisco adaptive security appliance software 9.12.1 • cisco adaptive security appliance software 9.12.1.2 • cisco adaptive security appliance software 9.12.1.3 • cisco adaptive security appliance software 9.12.2 • cisco adaptive security appliance software 9.12.2.1 • cisco adaptive security appliance software 9.12.2.4 • cisco adaptive security appliance software 9.12.2.5 • cisco adaptive security appliance software 9.12.2.9 • cisco adaptive security appliance software 9.12.3 • cisco adaptive security appliance software 9.12.3.2 • cisco adaptive security appliance software 9.12.3.7 … and 207 more

Weakness · CWE (1)

CWE-835 Loop with Unreachable Exit Condition weakness

References