Overview
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2; https://nvd.nist.gov/vuln/detail/CVE-2024-20353
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2024-20353 |
| Vendor / Product | Cisco — Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) |
| NVD Published | 2024-04-24 |
| NVD Last Modified | 2025-10-28 |
| CVSS 3.1 Score | 8.6 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| Severity | HIGH |
| CWE | CWE-835 |
| CISA KEV Added | 2024-04-24 |
| CISA KEV Deadline | 2024-05-01 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2024-05-01.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2024-04-24 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2024-05-01 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2024-20353 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |