CVE-1999-0440: Netscape Communicator

High severity, CVSS 7.5. EPSS: 3.6% chance of exploitation in the next 30 days.

The byte code verifier component of the Java Virtual Machine (JVM) allows remote execution through malicious web pages.

Affected products

• Netscape Communicator: version 4.5 only
• Netscape Navigator: version 4.0 only; version 4.01 only; version 4.02 only; version 4.03 only; version 4.04 only; version 4.05 only; …
• Sun Java: any version

Published 1999-03-01. Last modified 2026-06-16.