If you run OpenSSL, this is very bad. Read and patch NOW

[Warbird]

Now that they're releasing patches and this is public domain:

http://www.zdnet.com/heartbleed-security-patches-coming-fast-and-furious-7000028216/

This one is bad, real bad.  And it's been out there a while.  If you believe your private keys were compromised, you can update them after you patch.  Sadly, there is no way to know for sure.