I read the article and it didn't really specify which versions are affected. I run 2.2.19 and by the article, all version seem the affected othen than 2.2.20, is this correct?
I think so, yes. I talked to my host last night and they upgraded my Apache with the newest version that has the fix. They told me that the fix was released 4 days ago and that they were trying to catch all the accounts up.
If you run CPanel, it should be available in there.