CVE-2024-20256: Cisco Asyncos

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email and Web Manager and Secure Web Appliance could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user input. 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 execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Affected products

• Cisco Asyncos: version 11.7.0-406 only; version 11.7.0-418 only; version 11.7.1-006 only; version 11.7.1-020 only; version 11.7.1-049 only; version 11.7.2-011 only; …
• Cisco Secure Email And Web Manager Virtual Appliance m100v: affected versions not specified
• Cisco Secure Email And Web Manager Virtual Appliance m300v: affected versions not specified
• Cisco Secure Email And Web Manager Virtual Appliance m600v: affected versions not specified

Published 2024-05-15. Last modified 2026-06-17.