Microsoft has issued an emergency patch to fix a SMBv3 wormable bug that leaked earlier this week. The bug affects version 3.1.1 of Microsoft s SMB file-sharing system and was not included in Patch Tuesday, but patched the following day. Microsoft issued its advisory only after details of the bug were published online by Cisco Talos and Fortinet both posts have since been taken down. While the bug is dangerous, researchers said this bug likely won t lead to WannaCry 2.0
Source: https://threatpost.com/wormable-unpatched-microsoft-bug/153632/