CVE-2024-20495
Detail
Description
A vulnerability in the Remote Access VPN feature of 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 on an affected device.
This vulnerability is due to improper validation of client key data after the TLS session is established. An attacker could exploit this vulnerability by sending a crafted key value to an affected system over the secure TLS session. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
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:
NVD assessment
not yet provided.
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.
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Weakness Enumeration
CWE-ID
CWE Name
Source
CWE-20
Improper Input Validation
Cisco Systems, Inc.
Change History
3 change records found show changes
Reanalysis by NIST 8/15/2025 12:40:50 PM
Action
Type
Old Value
New Value
Added
CPE Configuration
Record truncated, showing 2048 of 3314 characters. View Entire Change Record OR
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.7.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.4:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.1.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.2.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.4:*:*:*:*:*:*:*
*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:6.4.0.8:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.9:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.10:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.11:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.12:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.13:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.14:*:*
Added
CPE Configuration
Record truncated, showing 2048 of 11364 characters. View Entire Change Record OR
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.29:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.26:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.1.30:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.1.15:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.12:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.15:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.45:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.7:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.12:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.37:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.38:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.39:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.2.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.20:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.25:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.41:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.44:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_a
Removed
CPE Configuration
Record truncated, showing 2048 of 3314 characters. View Entire Change Record OR
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.7.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.4:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.1.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.2.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.4:*:*:*:*:*:*:*
*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:6.6.7:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.7.1:*:*:*:*:*:*:*
*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_defense:6.4.0.10:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.11:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.12:*:*:*:*
Removed
CPE Configuration
Record truncated, showing 2048 of 11364 characters. View Entire Change Record OR
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.29:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.26:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.1.30:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.1.15:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.12:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.15:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.45:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.7:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.12:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.37:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.38:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.39:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.2.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.25:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.20:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.41:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.44:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_a
Initial Analysis by NIST 8/01/2025 2:42:46 PM
Action
Type
Old Value
New Value
Added
CPE Configuration
Record truncated, showing 2048 of 3314 characters. View Entire Change Record OR
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.7.0:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.4:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.1.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.2:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.2.1:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.3:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:7.0.4:*:*:*:*:*:*:*
*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:6.6.7:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.6.7.1:*:*:*:*:*:*:*
*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_defense:6.4.0.10:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.11:*:*:*:*:*:*:*
*cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.12:*:*:*:*
Added
CPE Configuration
Record truncated, showing 2048 of 11364 characters. View Entire Change Record OR
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.1:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.29:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.26:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.1.30:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.1.15:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.12:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.15:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.45:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.7:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.12:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.37:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.38:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.39:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.2:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.14.2.4:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.25:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.20:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.41:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.44:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3:*:*:*:*:*:*:*
*cpe:2.3:o:cisco:adaptive_security_a
Added
Reference Type
Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-vpn-cZf8gT Types: Vendor Advisory
New CVE Received from Cisco Systems, Inc. 10/23/2024 2:15:13 PM
Action
Type
Old Value
New Value
Added
Description
A vulnerability in the Remote Access VPN feature of 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 on an affected device.
This vulnerability is due to improper validation of client key data after the TLS session is established. An attacker could exploit this vulnerability by sending a crafted key value to an affected system over the secure TLS session. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
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-20
Added
Reference
Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-vpn-cZf8gT [No types assigned]
Quick Info
CVE Dictionary Entry: CVE-2024-20495 NVD
Published Date: 10/23/2024 NVD
Last Modified: 08/15/2025
Source: Cisco Systems, Inc.
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