A third critical bulletin, MS10-034, involves ActiveX Kill Bits and affects Windows 2000, XP, Vista and Windows 7. Kill Bits ensure that vulnerable ActiveX controls can no longer be exploited through Internet Explorer.
Typically, Kill Bits are issued for third-party software, rather than for software created by Microsoft, according to Storms. What is unusual about MS10-034 is that two out of the six Kill Bits being issued are for Microsoft ActiveX controls.
"What that means is Microsoft has found one of their ActiveX controls to be vulnerable as well," Storms said. "Today they found two. That's unusual. We haven't seen that from Microsoft since last summer."
Overall, this was a record-setting month for Patch Tuesday.
"This is the largest Microsoft patch release of 2010 and ties the record for the most vulnerabilities ever addressed in a single month; a record set in October of last year," Talbot of Symantec said. "This month's release also features the largest ever single bulletin, with 14 vulnerabilities in Excel being addressed together."
Follow Jon Brodkin on Twitter: www.twitter.com/jbrodkin
Read more about wide area network in Network World's Wide Area Network section.