CVE-2000-0517: Netscape Communicator

Medium severity, CVSS 5.0. EPSS: 1.3% chance of exploitation in the next 30 days.

Netscape 4.73 and earlier does not properly warn users about a potentially invalid certificate if the user has previously accepted the certificate for a different web site, which could allow remote attackers to spoof a legitimate web site by compromising that site's DNS information.

Affected products

• Netscape Communicator: version 4.0 only; version 4.5 only; version 4.6 only; version 4.7 only; version 4.51 only; version 4.61 only; …

Published 2000-05-26. Last modified 2026-06-16.