CVE-2021-1444: 
Cisco Adaptive Security Appliance (ASA) vulnerability analysis and mitigation

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interface. The vulnerability was disclosed on October 27, 2021, and is tracked as CVE-2021-1444 (Cisco Advisory).

The vulnerability is due to insufficient validation of user-supplied input by the web services interface of an affected device. It has been assigned a CVSS v3.1 Base Score of 6.1 MEDIUM (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) and is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation) (Cisco Advisory).

A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. The vulnerability affects devices running vulnerable releases of Cisco ASA Software or Cisco FTD Software with vulnerable AnyConnect or WebVPN configurations (Cisco Advisory).

Cisco has released software updates that address this vulnerability. There are no workarounds available. The fixed releases include ASA Software versions 9.8.4.40, 9.12.4.26, 9.14.3, 9.15.1.17, and 9.16.1.28, as well as FTD Software versions 6.4.0.13, 6.6.5, 6.7.0.3, and 7.0.1 (Cisco Advisory).