A vulnerability in the web framework of Cisco Security Manager could allow an unauthenticated, remote attacker to inject a crafted HTTP header, which will cause a web page redirection to a possible malicious website. The vulnerability is due to insufficient validation of user input before using it as an HTTP header value. An attacker could exploit this vulnerability by convincing a user to access a crafted URL. Cisco has confirmed the vulnerability in a security notice; however, software updates are not available. To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.