A working commercial exploit is available through VUPEN Security - Exploit and PoCs Service. This exploit is not otherwise publicly available or known to be circulating in the wild.
Core Security Technologies has developed a working commercial exploit for its CORE IMPACT product. This exploit is not otherwise publicly available or known to be circulating in the wild.
UPDATE (April 6, 2009): Symantec has detected active exploit attempts of this issue in the wild.
An exploit is available in the references section of this document.
The following example exploit is available: