I have just released Mailman 2.0.14 as a patch-only release. This fixes a DoS bug to be described in CAN-2003-0991. See here for details:
Please note that since I am no longer actively maintaining Mailman 2.0, this release has had only limited testing. It is recommended that all sites running Mailman 2.0 upgrade to 2.1 where ever possible. For those sites that cannot upgrade, this patch may be useful.
Also note that it is no longer possible to download tarballs of Mailman 2.0 from SourceForge.