Courier · Courier Mta · CVE-2006-2659
**Name of the Vulnerable Software and Affected Versions**
Courier MTA versions prior to 0.53.2
**Description**
The issue allows attackers to cause a denial of service, specifically CPU consumption, by exploiting how usernames with the "=" character are handled during encoding.
**Recommendations**
For versions prior to 0.53.2, update to version 0.53.2 or later to resolve the issue.