ZoneAlarm version 8.0.020.000 appears vulnerable to a denial of service condition that leaves in inoperable for a period of time, leaving the user vulnerable to attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/70395/zonealarm-crash.txt
Source: https://packetstormsecurity.com/files/70395/zonealarm-crash.txt.html