Flaw bug created to hold information about an old flaw we knew something about. For more details see the MITRE CVE description.
MITRE description: Cross-site scripting (XSS) vulnerability in the decoding of encoded text in certain headers in mime.php for SquirrelMail 1.4.3a and earlier, and 1.5.1-cvs before 23rd October 2004, allows remote attackers to execute arbitrary web script or HTML.