annclist.exe in webTV for Windows allows remote malicious users to cause a denial of service by via a large, malformed UDP packet to ports 22701 up to and including 22705.
source: wwwsecurityfocuscom/bid/1671/info
If a remote user sends a UDP packet to any port in the 22701 - 22705 range to a system running WebTV for Windows, the system may crash entirely or at the least the program will stop responding
As well, sending a UDP packet to port 22703 specifically has been known to cause automatic reboots
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