CVE-2004-1534: Zonelabs Zonealarm

Medium severity, CVSS 5.0. EPSS: 1.8% chance of exploitation in the next 30 days.

ZoneAlarm and ZoneAlarm Pro before 5.5.062, with ad-blocking enabled, allows remote web sites to cause a denial of service (application instability or system hang) via certain JavaScript.

Affected products

• Zonelabs Zonealarm: version 4.0 only; version 4.5 only; version 4.5.538.001 only; version 5.0.590.015 only; version 5.5 only

Published 2004-12-31. Last modified 2026-06-16.