CVE-2024-20353
Detail
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.
Metrics
CVSS Version 4.0
CVSS Version 3.x
CVSS Version 2.0
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
CVSS 3.x Severity and Vector Strings:
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
NVD assessment
not yet provided.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving NIST webspace.
We have provided these links to other web sites because they
may have information that would be of interest to you. No
inferences should be drawn on account of other sites being
referenced, or not, from this page. There may be other web
sites that are more appropriate for your purpose. NIST does
not necessarily endorse the views expressed, or concur with
the facts presented on these sites. Further, NIST does not
endorse any commercial products that may be mentioned on
these sites. Please address comments about this page to [email protected] .
This CVE is in CISA's Known Exploited Vulnerabilities Catalog
Reference
CISA's BOD 22-01 and Known
Exploited Vulnerabilities Catalog for further guidance and requirements.
Vulnerability Name
Date Added
Due Date
Required Action
Cisco ASA and FTD Denial of Service Vulnerability
04/24/2024
05/01/2024
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Weakness Enumeration
CWE-ID
CWE Name
Source
CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
NIST
Cisco Systems, Inc.
Change History
14 change records found show changes
CVE Modified by CISA-ADP
6/17/2026 3:06:47 AM
Action
Type
Old Value
New Value
Added
Affected
Record truncated, showing 2048 of 4449 characters.
View Entire Change Record
[{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.8.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.8.1","lessThanOrEqual":"9.8.4.48","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.12.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.12.1","lessThanOrEqual":"9.12.4.65","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.14.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.14.1","lessThan":"9.14.4.23","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.15.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.15.1","lessThanOrEqual":"9.15.1.21","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.16.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.16.1","lessThanOrEqual":"9.16.4.55","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.17.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.17.1","lessThanOrEqual":"9.17.1.33","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.18.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.18.1","lessThanOrEqual":"9.18.4.8","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.19.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.19.1","lessThanOrEqual":"9.19.1.27","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"asa","defaultStatus":"unknown","cpes":["cpe:2.3:a:cisco:asa:9.20.1:*:*:*:*:*:*:*"],"versions":[{"version":"9.20.1","lessThanOrEqual":"9.20.2","versionType":"custom","status":"affected"}]},{"vendor":"cisco","product":"firepower_threat_defense_software","defaultStatus":"
Added
SSVC
{"timestamp":"2024-04-29T20:02:41.285934Z","id":"CVE-2024-20353","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}
CVE Modified by Cisco Systems, Inc.
6/17/2026 3:06:47 AM
Action
Type
Old Value
New Value
Added
Affected
Record truncated, showing 2048 of 11561 characters.
View Entire Change Record
[{"vendor":"Cisco","product":"Cisco Adaptive Security Appliance (ASA) Software","versions":[{"version":"9.8.1","status":"affected"},{"version":"9.8.1.5","status":"affected"},{"version":"9.8.1.7","status":"affected"},{"version":"9.8.2","status":"affected"},{"version":"9.8.2.8","status":"affected"},{"version":"9.8.2.14","status":"affected"},{"version":"9.8.2.15","status":"affected"},{"version":"9.8.2.17","status":"affected"},{"version":"9.8.2.20","status":"affected"},{"version":"9.8.2.24","status":"affected"},{"version":"9.8.2.26","status":"affected"},{"version":"9.8.2.28","status":"affected"},{"version":"9.8.2.33","status":"affected"},{"version":"9.8.2.35","status":"affected"},{"version":"9.8.2.38","status":"affected"},{"version":"9.8.3.8","status":"affected"},{"version":"9.8.3.11","status":"affected"},{"version":"9.8.3.14","status":"affected"},{"version":"9.8.3.16","status":"affected"},{"version":"9.8.3.18","status":"affected"},{"version":"9.8.3.21","status":"affected"},{"version":"9.8.3","status":"affected"},{"version":"9.8.3.26","status":"affected"},{"version":"9.8.3.29","status":"affected"},{"version":"9.8.4","status":"affected"},{"version":"9.8.4.3","status":"affected"},{"version":"9.8.4.7","status":"affected"},{"version":"9.8.4.8","status":"affected"},{"version":"9.8.4.10","status":"affected"},{"version":"9.8.4.12","status":"affected"},{"version":"9.8.4.15","status":"affected"},{"version":"9.8.4.17","status":"affected"},{"version":"9.8.4.25","status":"affected"},{"version":"9.8.4.20","status":"affected"},{"version":"9.8.4.22","status":"affected"},{"version":"9.8.4.26","status":"affected"},{"version":"9.8.4.29","status":"affected"},{"version":"9.8.4.32","status":"affected"},{"version":"9.8.4.33","status":"affected"},{"version":"9.8.4.34","status":"affected"},{"version":"9.8.4.35","status":"affected"},{"version":"9.8.4.39","status":"affected"},{"version":"9.8.4.40","status":"affected"},{"version":"9.8.4.41","status":"affected"},{"version":"9.8.4.43","status":"affected"},{"version":"9.8.4.44","status":"affected
Modified Analysis by NIST
10/28/2025 9:59:54 AM
Action
Type
Old Value
New Value
Added
Reference Type
CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20353 Types: US Government Resource
CVE Modified by CISA-ADP
10/21/2025 7:16:20 PM
Action
Type
Old Value
New Value
Added
Reference
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20353
CVE Modified by CISA-ADP
10/21/2025 4:19:52 PM
Action
Type
Old Value
New Value
Removed
Reference
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20353
CVE Modified by CISA-ADP
10/21/2025 3:20:34 PM
Action
Type
Old Value
New Value
Added
Reference
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20353
Modified Analysis by NIST
7/30/2025 3:25:41 PM
Action
Type
Old Value
New Value
Added
Reference Type
CISA-ADP: https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/ Types: Exploit, Third Party Advisory
CVE Modified by CISA-ADP
7/29/2025 10:17:10 PM
Action
Type
Old Value
New Value
Added
Reference
https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/
Modified Analysis by NIST
1/27/2025 3:56:54 PM
Action
Type
Old Value
New Value
CVE Modified by CVE
11/21/2024 3:52:26 AM
Action
Type
Old Value
New Value
Added
Reference
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2
CVE Modified by Cisco Systems, Inc.
5/14/2024 10:51:04 AM
Action
Type
Old Value
New Value
Initial Analysis by NIST
4/26/2024 11:22:27 AM
Action
Type
Old Value
New Value
Added
CVSS V3.1
NIST AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Added
CWE
NIST CWE-835
Added
CPE Configuration
Record truncated, showing 2048 of 5485 characters.
View Entire Change Record
OR
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.4:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.5:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.6:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.7:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.8:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.9:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.10:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.11:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.12:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.13:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.14:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.15:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.16:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.17:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.18:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.4:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.5:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.6:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.7:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.8:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.9:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_
Added
CPE Configuration
Record truncated, showing 2048 of 15355 characters.
View Entire Change Record
OR
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.1.5:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.1.7:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.8:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.14:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.15:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.17:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.20:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.24:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.26:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.28:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.33:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.35:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.2.38:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.8:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.11:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.14:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.16:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.18:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.21:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.26:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.3.29:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4:*:*:*:*:*:*:*
*cpe:2
Changed
Reference Type
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2 No Types Assigned
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2 Vendor Advisory
CVE CISA KEV Update by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
4/25/2024 9:00:01 PM
Action
Type
Old Value
New Value
Added
Date Added
2024-04-24
Added
Due Date
2024-05-01
Added
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Added
Vulnerability Name
Cisco ASA and FTD Denial of Service Vulnerability
New CVE Received from Cisco Systems, Inc.
4/24/2024 3:15:46 PM
Action
Type
Old Value
New Value
Added
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.
Added
CVSS V3.1
Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Added
CWE
Cisco Systems, Inc. CWE-835
Added
Reference
Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2 [No types assigned]
Quick Info
CVE Dictionary Entry: CVE-2024-20353 NVD
Published Date: 04/24/2024 NVD
Last Modified: 06/17/2026
Source: Cisco Systems, Inc.