Adobe declined to comment on how the CVE-2011-2444 vulnerability was being exploited and instead referred questions to Google. The latter did not immediately reply to an emailed query.

Four of the five other Flash bugs that Adobe patched today could be exploited by attackers to run their malicious code on victimized computers, Adobe said in its advisory.

Wednesday's Flash update was the first since on Aug. 9. Adobe has fixed Flash eight times so far this year, including several emergency, or "out-of-band," updates rushed to users because attacks were under way.

The patched versions of for Windows, Mac, Linux and Solaris can be downloaded from Adobe's Web site. Alternately, users can run Flash's update tool or wait for the software to prompt them that a new version is available.

Android users must browse to the Android Market to update Flash.