CVE-2021-1504
HIGHCisco Adaptive Security Appliance and Firepower Threat Defense - Unauthenticated Denial of Service via HTTPS Request
Title source: llmDescription
Multiple vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to lack of proper input validation of the HTTPS request. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
x_refsource_cisco
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-vpn-dos-fpBcpEcD
Scores
CVSS v3
8.6
EPSS
0.0031
EPSS Percentile
54.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-787
Status
published
Products (2)
cisco/adaptive_security_appliance_software
9.7 - 9.8.4.35
cisco/firepower_threat_defense
6.5.0 - 6.6.4
Published
Apr 29, 2021
Tracked Since
Feb 18, 2026