Redmond’s monthly Patch Tuesday updates cover at least 70 documented vulnerabilities affecting the Windows ecosystem, including six critical issues that expose users to dangerous code execution attacks.

According to Microsoft, none of the vulnerabilities have been publicly discussed or exploited in the wild.

Windows network administrators are being urged to pay special attention to a trio of highly critical bugs in Windows Pragmatic General Multicast (PGM), the protocol used to deliver packets between multiple network members in a reliable manner.