Hi Team,
According to the below article there have been patches released for this but the problem that we have is we are running SharePoint 3.0 on Windows Server 2008 R2. Is there a relevant patch available for this Legacy version?
https://blogs.msdn.microsoft.com/rodneyviana/2018/09/13/after-installing-net-security-patches-to-address-cve-2018-8421-sharepoint-workflows-stop-working/
Many thanks
Steven Marshall