http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-2821 "SQL injection vulnerability in wp-admin/admin-ajax.php in WordPress before 2.2 allows remote attackers to execute arbitrary SQL commands via the cookie parameter."
wordpress-2.2.1-1.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.