GEN:SID 1:2670
Message WEB-CGI pgpmail.pl access
Summary This event is generated when an attempt is made to access the file
pgpmail.pl.
Impact Possible unauthorized administrative access to the victim host.
Detailed Information The script pgpmail.pl does not properly sanitize user supplied input.
This may allow an attacker to supply commands of their choosing to the
victim host with the privileges of the user running the web server.
Affected Systems pgpmail prior to and including 3.6
Attack Scenarios An attacker can supply arbitrary commands to the pgpmail.pl script.
Ease of Attack Simple
Corrective Action Uninstall the script pgpmail.pl

Only allow usage from authenticated users
Additional References  
Rule References cve: 2001-0937
nessus: 11070