Hello Sebastian,
For general release, as it is not listed alongside 5.5-6.5 in the VS&CB announcement, my own opinion is: I doubt it.
"VMware does not offer new hardware support, server/client/guest operating system updates, new security patches or bug fixes unless otherwise noted"
https://kb.vmware.com/s/article/2145103
Extended support (relatively Pricey!) *may* include some form of patch for this depending on viability:
"New Security Patches Annual security patch. Includes catastrophic/critical security fixes only"
"New Bug Fixes Ability to create hot patches for Severity 1 issues only" https://www.vmware.com/support/services/extended.html
Do understand that hot patches are generally non-trivial and need to be customized to suit the environment they are being applied to and thus even if something were to get hot patched for a specific environment, this does not mean the changes made in this could be used to create any form of universal patch for all 5.1 hosts.
Bob
