Also, where is XSA-252 ? They haven't skipped any number before.

@rootkovska says it might not be the end of the world: https://twitter.com/rootkovska/status/948468824310976513

There's also a planned azure maintenance next monday: https://social.msdn.microsoft.com/Forums/azure/en-US/1949c2d...

> The lack of a similar statement for a skipped XSA number normally means that the issue is being investigated within the Xen Project Security Team.