Ingate Firewall before 4.3.4 and SIParator before 4.3.4 allows remote attackers to cause a denial of service (kernel deadlock) by sending a SYN packet for a TCP stream, which requires an RST packet in response.
Ingate Firewall 4.1.3 and earlier does not terminate the PPTP session for an active user when the administrator disables that user from a resource, which could allow remote authenticated users to retain unauthorized access to resources.