CVE-2001-1155: Freebsd

Critical severity, CVSS 9.8. EPSS: 2% chance of exploitation in the next 30 days.

TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled does not properly check the result of a reverse DNS lookup, which could allow remote attackers to bypass intended access restrictions via DNS spoofing.

Affected products

• Freebsd Freebsd: from 4.1.1, up to and including 4.3

Published 2001-08-23. Last modified 2026-06-16.