The following errata for CentOS-2 have been built and uploaded to the centos mirror:
RHBA-2005:145-12 dos2unix and unix2dos bug fix update
Files available: dos2unix-3.1-7.EL.22.i386.rpm unix2dos-2.2-12.EL.25.i386.rpm
More details are available from the RedHat web site at https://rhn.redhat.com/errata/rh21as-errata.html
The easy way to make sure you are up to date with all the latest patches is to run: # yum update