CentOS Errata and Security Advisory 2006:0267
https://rhn.redhat.com/errata/RHSA-2006-0267.html
The following updated files have been uploaded and are currently syncing to the mirrors:
x86_64 ipsec-tools-0.3.3-6.rhel4.1.x86_64.rpm
src: ipsec-tools-0.3.3-6.rhel4.1.src.rpm