The remote web server is affected by an authentication bypass flaw.
The remote host is running ViRobot Linux Server, a commercial anti-virus application server. The installed version of ViRobot Linux Server has a flaw such that an attacker can bypass authentication and gain access to its 'filescan' component by supplying a special cookie. An unauthenticated attacker may be able to leverage this flaw to delete arbitrary files on the remote host or disable access to the service by submitting scans of a large number of large files on the remote host.
Upgrade or patch according to vendor recommendations.