Check Point VPN-1/FireWall-1 4.1 base.def contains a default macro, accept_fw1_rdp, which can allow remote attackers to bypass intended restrictions with forged RDP (internal protocol) headers to UDP port 259 of arbitrary hosts.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6815
http://www.securityfocus.com/bid/2952
http://www.kb.cert.org/vuls/id/310295
http://www.checkpoint.com/techsupport/alerts/rdp.html
http://www.cert.org/advisories/CA-2001-17.html
http://ciac.llnl.gov/ciac/bulletins/l-109.shtml
http://archives.neohapsis.com/archives/bugtraq/2001-07/0128.html