Secure Email and Web
CVE-2024-20392: A vulnerability in the web-based management API of Cisco AsyncOS Software for Cisco Secure Email Gateway co…
A vulnerability in the web-based management API of Cisco AsyncOS Software for Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to conduct an HTTP response splitting attack.
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 Email 11.0 | See the advisory |
| Cisco Secure Email 11.1 | See the advisory |
| Cisco Secure Email 11.1 | See the advisory |
| Cisco Secure Email 12.0 | See the advisory |
| Cisco Secure Email 12.1 | See the advisory |
| Cisco Secure Email 12.1 | See the advisory |
| Cisco Secure Email 12.1 | See the advisory |
| Cisco Secure Email 13.0 | See the advisory |
| Cisco Secure Email 13.0 | See the advisory |
| Cisco Secure Email 13.5 | See the advisory |
| Cisco Secure Email 13.5 | See the advisory |
| Cisco Secure Email 12.5 | See the advisory |
| Cisco Secure Email 12.5 | See the advisory |
| Cisco Secure Email 12.5 | See the advisory |
| Cisco Secure Email 14.0 | See the advisory |
| Cisco Secure Email 14.2 | See the advisory |
| Cisco Secure Email 14.2 | See the advisory |
| Cisco Secure Email 14.3 | See the advisory |
| Cisco Secure Email 15.0 | See the advisory |
| Cisco Secure Email 15.0 | See the advisory |
| Cisco Secure Email 15.5 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A vulnerability in the web-based management API of Cisco AsyncOS Software for Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to conduct an HTTP response splitting attack. This vulnerability is due to insufficient input validation of some parameters that are passed to the web-based management API of the affected system. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to perform cross-site scripting (XSS) attacks, resulting in the execution of arbitrary script code in the browser of the targeted user, or could allow the attacker to access sensitive, browser-based information.
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.