Computerworld polled a panel of security experts to find the five security fixes everyone should deploy from the last 12 months. Microsoft set a record in October for the most updates and most flaws fixed in a single month. Microsoft rushed out a pair of updates to preempt a presentation at Black Hat that was to reveal a way for attackers to bypass the “kill-bit” defenses that Microsoft frequently deploys as a stop-gap measure for fixing bugs. Microsoft also admitted that an extraneous “&” character in its Active Template Library (ATL) was the root of the bug.”]
Source: https://www.csoonline.com/article/2124696/the-5-essential-patches-of-2009.html