If you own SDC (transparent form) which apparently is usually the case, you would not have been affected at all. If you owned Shadow (obfuscated form) you should consider the privacy that was supposed to have been provided by Shadow to be destroyed and you should move the coins several times using the new (presumably fixed) version if you want any sort of privacy there.

I know SDC supporters like to say that the exploit didn't matter because it still had stealth addresses, but that is pretty much wrong. The method depends on having both untracability and unlinkability for privacy; just one or the other is very ineffective. That's why coins that just use stealth addresses with no method of untraceabilty are not considered a viable solution to blockchain privacy.

EDIT: typo, add not above