The reported problem with this hotfix and Zope 2.4 has been resolved, and the file has been updated on www.zope.org at the URL mentioned in the original announcement: Brian Lloyd wrote:

This hotfix addresses a potential denial-of-service vulnerability in applications that use the Python cgi module (cgi.py) for parsing of "multipart" Web form data (Zope uses this functionality internally).

More detailed information is available in the Python bug tracker at SourceForge:

http://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=44...

While we are not aware of any instances of abuse of this vulnerability, we *highly* recommend that any Zope site running versions of Zope up to and including 2.4.0 have this hotfix product installed to mitigate this issue. (Zope 2.4.1 will not require the installation of a separate hotfix).

http://www.zope.org/Products/Zope/Hotfix_2001-07-25/README.txt

http://www.zope.org/Products/Zope/Hotfix_2001-07-25/Hotfix_2001-07-25.tar.gz