Microsoft announced Thursday that it will fix some 22 security vulnerabilities when it releases a baker's dozen of monthly patches next Tuesday, its regular date for releasing product fixes.

The release won't be quite as demanding as some recent Patch Tuesday drops, however, since only two of the 13 patches rate a "critical" ranking on Microsoft's (NASDAQ: MSFT) four-tier severity scale. Critically-rated patches are typically of a more demanding nature.

Still, despite the fact that many of the patches are ranked "important," a step down from critical, they still consume security administrators' time and resources, especially ones that require a reboot after installation.

"Microsoft is making IT admins earn their Labor Day holiday with 13 bulletins across a broad range of Microsoft OS platforms, Office and developer tools this month," Paul Henry, security and forensic analyst for security vendor Lumension, said in an email to [Editor's Note: The original version of this article published on August 5 wrongly stated Paul Henry worked for Qualys instead of Lumension.]

"If left unpatched, attackers could use this vulnerability to remotely take control of victims' systems," Kandek added.

Microsoft has had a number of jam-packed, record or near-record, Patch Tuesday events in recent months, that have had enterprise security administrators working nights and overtime to keep up.

Those, however, have been interspersed with Patch Tuesdays (so-called because Microsoft releases almost all of its security fixes on the second Tuesday of each month) where there have been few high-profile patches.

Microsoft will release its August 2011 security bulletins and patches on Tuesday, August 9.

Stuart J. Johnston is a contributing editor at, the news service of, the network for technology professionals. Follow him on Twitter @stuartj1000.