> Initial appraisals are that public-facing systems are likely not subject to shellshock.

All the managers I know will stop reading after this, sit back and think "aaah, those silly techies. Worrying about nothing".

I gave exactly the opposite advice: We should assume every public and non-public facing system is vulnerable (many were). I'd rather cause a big stinky scare and be proven wrong than downplaying the issue and being proven wrong.. the hard way.

You probably had a good reason for saying this to your organisation, but it's not something that other people should blindly re-use for their own purposes.