The web framework in Cisco AsyncOS on Email Security Appliance (ESA), Content Security Management Appliance (SMA), and Web Security Appliance (WSA) devices allows remote attackers to trigger redirects via a crafted HTTP header, aka Bug IDs CSCur44412, CSCur44415, CSCur89630, CSCur89636, CSCur89633, and CSCur89639.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.