Red Hat does not consider this to be a security flaw as a user executing these commands will only succeed in preventing service to the current connection, and not to the server as a whole.
CVSS v2 metrics
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Affected Packages State
|Red Hat Enterprise Linux 5||dovecot||Not affected|
|Red Hat Enterprise Linux 6||dovecot||Affected|