The affected MySQL products are:
- Oracle MySQL Enterprise Monitor, versions 2.3, 3.0
- Oracle MySQL Server, versions 5.1, 5.5, 5.6
For MySQL 5.6 you should upgrade to 5.6.15
For MySQL 5.5 you should upgrade to 5.5.35
For MySQL 5.1 you should upgrade to 5.1.73
If you use the MySQL release from your distribution you should ask them to fix the CVE numbers fixed in these releases (if they didn't do that already).
The highest CVSS score for MEM is 10 and for MySQL the highest score is 6.8.
Update: for more information see this blog post by Dave Stokes.