Microsoft Internet Information Services (IIS) 6.0 allows remote attackers to cause a denial of service (server instability or device hang), and possibly obtain sensitive information (device communication traffic); and might allow attackers with physical access to execute arbitrary code after connecting a data stream to a device COM port; via requests for a URI containing a '/' immediately before and after the name of a DOS device, as demonstrated by the /AUX/.aspx URI, which bypasses a blacklist for DOS device requests.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34418
http://seclists.org/fulldisclosure/2007/May/0378.html
http://archives.neohapsis.com/archives/fulldisclosure/2007-05/0419.html