CVE-2000-0553: Darren Reed Ipfilter

Low severity, CVSS 2.6. EPSS: 1.4% chance of exploitation in the next 30 days.

Race condition in IPFilter firewall 3.4.3 and earlier, when configured with overlapping "return-rst" and "keep state" rules, allows remote attackers to bypass access restrictions.

Affected products

• Darren Reed Ipfilter: version 3.3.15 only; version 3.4.3 only

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