The host is installed with Mozilla Firefox before 3.6.23 and 4.x through 6, Thunderbird before 7.0, and SeaMonkey before 2.4 and is prone to a HTTP response splitting vulnerability. A flaw is present in the applications, which fail to handle HTTP responses that contain multiple Location, Content-Length, or Content-Disposition headers. Successful exploitation could allow attackers to conduct HTTP response splitting attacks.