As always, rumors are slightly exaggerated.
Not all third-party vendors are affected by this issue.
FYI, there is a retaliatory Veeam’s blog post regarding Symantec’s original statement and also regarding technical explanation of Veeam’s vSphere 5.1 support.
http://www.veeam.com/blog/symantec-admits-all-its-vmware-backup-customers-are-in-danger.html
Hope you will find it useful.
Thanks.