Probably not major, since nothing exploits it yet.
iDEFENSE discovered and reported this vulnerability to Adobe back in March. Adobe fixed the flaw in version 6.0.2, released 7 June 2004, but did not issue a vendor security advisory, merely refering to the issue as “Security update to further restrict malicious code execution.” in the change log.
The only way I could get to update Adobe Reader 6.0.1 to 6.0.2 was to click on the Updates option, whereupon it did a download and then required me to reboot to do the install. And that’s for a File Viewer!
Anyone else agree that this is another firm too big for its boots?
John