Secure Email and Web
CVE-2026-20152: Cisco Secure Web Appliance Authentication Service Traffic Bypass Vulnerability
A vulnerability in the authentication service feature of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass authentication policy requirements.
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 Secure Web Appliance 11.8 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 14.1 | See the advisory |
| Cisco Secure Web Appliance 14.1 | See the advisory |
| Cisco Secure Web Appliance 14.1 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 11.8 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 11.8 | See the advisory |
| Cisco Secure Web Appliance 11.8 | See the advisory |
| Cisco Secure Web Appliance 11.8 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 11.8 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 15.0 | See the advisory |
| Cisco Secure Web Appliance 15.0 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 15.1 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 15.0 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 14.5 | See the advisory |
| Cisco Secure Web Appliance 12.0 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 11.8 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 14.0 | See the advisory |
| Cisco Secure Web Appliance 12.5 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 15.2 | See the advisory |
| Cisco Secure Web Appliance 14.6 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A vulnerability in the authentication service feature of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass authentication policy requirements.
This vulnerability is due to improper validation of user-supplied authentication input in HTTP requests. An attacker could exploit this vulnerability by sending HTTP requests that contain specific authentication requests to an affected device. A successful exploit could allow the attacker to bypass policy enforcement on the device. There is no direct impact to the Cisco Secure Web Appliance. However, as a result of exploiting this vulnerability, an attacker could send HTTP requests that should be restricted through the device.
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.