CVE-2024-20258: Cisco Asyncos

Medium severity, CVSS 6.1. 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 Email Gateway could allow an unauthenticated, 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: before 15.0.2-034 (fixed in 15.0.2-034); from 15.5, before 15.5.1-055 (fixed in 15.5.1-055); before 15.5.1-024 (fixed in 15.5.1-024)

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