Microsoft's latest monthly security update addresses 19 individual vulnerabilities within seven patches, all carrying a maximum severity rating of 'critical', the company's highest alert level.
Seven of the 19 vulnerabilities are in Office, each potentially allowing an attacker to remotely execute malware on a user's system.
Although all seven vulnerabilities carry a maximum rating of 'critical', they are only considered 'critical' for Office 2000 Service Pack 3.
The vulnerabilities were each given a lower rating of 'important' for Office 2002, 2003, 2007 and 2004 for Mac.
"These applications are the most frequently targeted by malware writers," he said. "We recommend that all customers evaluate their security coverage and policies to ensure they have adequate protection in place."
Securing the latest versions of Office has been a top priority for Microsoft, and it appears to have paid off this month. Only two of the seven vulnerabilities affected Office 2007, and neither was rated higher than 'important'.
Microsoft also patched six vulnerabilities in Internet Explorer. The patch is listed as 'critical' for IE6 and IE7 for Windows 2000, XP and Vista, and 'moderate' for IE6 and IE7 on Windows Server 2003.
Microsoft issued a patch for critical flaws in Windows Server's DNS component which was the subject of two separate incidents in April.
The two remaining patches addressed flaws in Microsoft Exchange, BizTalk Server and the Capicom security component for Windows.
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