Microsoft has prepared a Patch Tuesday security update to cover 34 vulnerabilities in Windows, Office and Internet Explorer.
The security update will be spread across 10 security bulletins.
Microsoft has said that six of the bulletins concern Windows OS, and that two of the six are rated 'Critical'. The other four are rated 'Important'.
The two bulletins concerning Office are rated 'Important' and one 'Important' rated bulletin concerns both Windows and Office.
Internet Explorer has one 'Critical' rated bulletin.
Wolfgang Kandek, the chief technology office at Qualys, wrote: “The June release is a large update and will keep system administrators busy, even if they have migrated to Windows 7 already.”
Microsoft has also reported that the company will be addressing two security advisories this month.
One will cover a vulnerability in Microsoft SharePoint that could allow elevation of privilege, whilst the other is regarding a vulnerability in Internet Explorer that is capable of allowing information disclosure.