Recently, there's been much talk in the news about CVE-2015-7547 affecting almost all Linux-based routers and many distributions.
A quick analysis shows that FreeBSD's native libraries are completely unaffected. If you are running Linux emulation binaries, you may be at risk, and should update the linux emulation package.
Dag-Erling SmΓΈrgrav has a good blog with all the details.
