SpamAssassin 3.1.x, 3.2.0, and 3.2.1 before 20070611, when running as root in unusual configurations using vpopmail or virtual users, allows local users to cause a denial of service (corrupt arbitrary files) via a symlink attack on a file that is used by spamd.

Apache SpamAssassin before 3.1.8 allows remote attackers to cause a denial of service via long URLs in malformed HTML, which triggers "massive memory usage."

SpamAssassin before 3.1.3, when running with vpopmail and the paranoid (-P) switch, allows remote attackers to execute arbitrary commands via a crafted message that is not properly handled when invoking spamd with the virtual pop username.