Google: Disclosure timeline for vulnerabilities under active attack

http://en.wikipedia.org/wiki/Google

We recently discovered that attackers are actively targeting a previously unknown and unpatched vulnerability in software belonging to another company. This isn’t an isolated incident — on a semi-regular basis, Google security researchers uncover real-world exploitation of publicly unknown (“zero-day”) vulnerabilities.

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Story added 3. June 2013, content source with full text you can find at link above.