Linksys WET11 firmware 1.31 and 1.32 allows remote attackers to cause a denial of service (crash) via a packet containing the device's hardware address as the source MAC address in the DLC header.
http://www.securityfocus.com/bid/6046
http://www.linksys.com/download/vertxt/WET11_fw_ver.TXT
http://www.iss.net/security_center/static/10472.php
http://archives.neohapsis.com/archives/vulnwatch/2002-q4/0045.html