Microsoft will deliver no fewer than 13 security bulletins on October's Patch Tuesday.
The bumper security update includes eight critical issues, and five that are classed as important. Windows 7 RTM also makes an appearance in the Patch Tuesday line-up for the first time.
The 13 bulletins address a total of 34 vulnerabilities, most of which are related to remote code execution. There are also fixes to counter denial-of-service attacks, elevation of privileges and spoofing.
The affected software includes every version of Windows, Internet Explorer, Office, Silverlight, SQL Server and more. Just to add to the IT department headaches, all of them will likely require a restart of the patched PC.
Even though it isn't officially launched yet, Windows 7 is affected by five of the bulletins, although only one of those is critical. The final RTM version of Windows 7 has been available for download to MSDN/TechNet subscribers and businesses for a few weeks now, even though consumers won't get their hands on the software until 22 October.
More than 700,000 people in the UK are also running the Windows 7 beta.
Internet Explorer 8 is also affected by one of the critical bugs.
The patch onslaught means it's likely to be a busy time for IT departments, many of which will want to test the updates before rolling them out across the company.
Superstitious readers will have noted the 13 patches will arrive on 13 October. Read the Microsoft Security Bulletin for full details.
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