ZoneAlarm and ZoneAlarm Pro allows a local attacker to cause a denial of service by running a trojan to initialize a ZoneAlarm mutex object which prevents ZoneAlarm from starting.

MailSafe in Zone Labs ZoneAlarm 2.6 and earlier and ZoneAlarm Pro 2.6 and 2.4 does not block prohibited file types with long file names, which allows remote attackers to send potentially dangerous attachments.