Is the 4.2.3 s.p. necessary for only for 4.2+ installs?

[socceronly]

I was hoping to get to upgrading to 4.2 mid September. 

Does the security patch apply to a pre 4.2 installation?

Like should I not wait in other words....

Thanks

JM

[David..]

All security patches are for latest versions only.

Meaning if you're running IPS4.0, you won't be getting any security patches at all unless you upgrade to the latest.

[GlenP]

But does the issue requiring a patch exist in 4.1.x or is it something that came about with the 4.2 changes?