CVE-2002-0515: Phildev Ipfilter

Medium severity, CVSS 5.0. EPSS: 2.2% chance of exploitation in the next 30 days.

IPFilter 3.4.25 and earlier sets a different TTL when a port is being filtered than when it is not being filtered, which allows remote attackers to identify filtered ports by comparing TTLs.

Affected products

• Phildev Ipfilter: up to and including 3.4.25

Published 2002-08-12. Last modified 2026-06-16.