Tiny Personal Firewall 1.0 and 2.0 allows local users to bypass filtering via non-standard TCP packets created with non-Windows protocol adapters.

Tiny Personal Firewall (TPF) 2.0.15, under certain configurations, will pop up an alert to the system even when the screen is locked, which could allow an attacker with physical access to the machine to hide activities or bypass access restrictions.

Tiny Personal Firewall 3.0 through 3.0.6 allows remote attackers to cause a denial of service (crash) by via SYN, UDP, ICMP and TCP portscans when the administrator selects the Log tab of the Personal Firewall Agent module.