Secure Firewall ASA and FTD
CVE-2021-1444: Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software Web Services Interface Cross-Site Scripting Vulnerability
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Cisco Adaptive Security Appliance (ASA) Software 9.4 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.0 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.4 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.5 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.1 | See the advisory |
| Cisco Adaptive Security Appliance (ASA) Software 9.3 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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. This vulnerability is due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. 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.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the October 2021 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see .
Exploitation
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.