After upgrading an SCCM 2012 R2 CU3 environment to SCCM 2012 R2 SP1 CU1, I expected to then manually be upgrading client systems. However, I find a few dozen client systems which have upgraded automatically to 5.00.8239.1000 without my saying so. The Hierarchy setting to upgrade clients automatically was/is not enabled - yet, here we are. Automatic Client push was/is also not enabled. Installation of the SCCM Client via Software Updates was/is not enabled.
The AdvertID that caused these clients to upgrade, according to execmgr.log is XXX20000 and this corresponds to an inbuilt/hidden offer in the database. I'd have expected this advert to be dormant/disabled UNLESS I enable the client upgrade option?
I find this quite disturbing, how else could these clients be upgrading themselves? Is there a bug in the upgrade process that allows this advert to slip through the net for a while? No other clients seem to be upgrading thems