Seems there may be some issues with TCP/IP implementations that leave open the possibility of easy (low traffic) DOS attacks. Unfortunately, I have no further details other than what I’ve read on a ComputerWorld article.

Interestingly, a snippet accompanying the link I received in email cannot be found in the article:

It involves crafting special packets to fill up transaction state tables on the system.

Maybe the person who sent it to me added that, or it got added somewhere along the line. But that certainly alludes to more detail than anything the article gives.