The product does not handle or incorrectly handles when a parameter, field, or argument name is specified, but the associated value is missing, i.e. it is empty, blank, or null.
CWE-229
CVE-2002-0422
Blank Host header triggers resultant infoleak.
CVE-2000-1006
Blank "charset" attribute in MIME header triggers crash.
CVE-2004-1504
Blank parameter causes external error infoleak.
CVE-2005-2053