An unpatched security flaw in Microsoft's Jet Database Engine is being used to launch targeted attacks against Windows users, according to an advisory from the software vendor.

The attacks, described by Microsoft as "very limited," are exploiting a buffer overrun vulnerability in the lightweight database that provides data access to applications such as Microsoft Access, Microsoft Visual Basic and third-party applications. Technical details on this zero-day vulnerability are not yet available but it is common knowledge that the Jet DB engine has suffered from major security issues over the last few years.

In fact, proof-of-concept exploit code targeting multiple Jet database engine flaws has been available on the Internet since April 2005. The public exploit code affects the same "msjet40.dll" component referenced in Microsoft's pre-patch advisory.

Read the full article at eWEEK.