From the News.com article:
IBM has issued a patch for a half dozen "highly critical" security flaws in versions of its Lotus Notes, which could allow a malicious attacker to execute arbitrary code remotely when users access files through the Notes attachment viewer.
Those are some more reasons to upgrade to 7.0.1. The Notes client has a pretty good track record of not normally needing this sort of patching attention, it's a shame that this exception had to be made.
Link: News.com: IBM Patches Lotus flaw
Link: Lotus.com/security
Link: Ed Brill: IBM Patches Lotus flaw
Technorati tags: Lotus, Notes, Domino