Most software vendors release their security updates on a set schedule. Microsoft, for example, ships its fixes on the second Tuesday of each month — the well-known “Patch Tuesday”. An out-of-band patch is the exception: an update pushed out off-schedule, ahead of the normal cycle, because the issue can’t wait. F5 did exactly this this week when it issued emergency fixes for two critical NGINX web-server flaws.

Vendors don’t break their own release schedule lightly, so an out-of-band patch is a signal in itself. It usually means the flaw is severe, easy to exploit, or already being used in attacks. Think of it like your dentist phoning to say come in today rather than waiting for your next check-up — the change of routine is the warning.

For your business, the practical takeaway is simple. When you hear that a vendor has released an emergency or out-of-band update, treat it as a priority rather than rolling it into your normal monthly maintenance window. The gap between a flaw being disclosed and being attacked is often measured in days, not weeks. If you’re not sure whether an out-of-band patch affects you, ask your IT provider which products you run and how quickly the fix will be applied.

Staying on top of which patches matter — and applying the urgent ones fast — is one of the quieter but more important parts of managed IT. If that’s currently left to chance in your business, it’s worth sorting out before the next emergency lands.