If some package have serious bug and fixed on unstable and testing release, how long it will be available on stable release?

[Robbi Nespu <robbinespu@gmail.com>]

Hello everyone,
I am curious something (as per title). I not sure whether to ask here or 
on devel mail list.

Yesterday on OFTC #debian, some guy ask about unfix CVE-2020-25681 to 
CVE-2020-25687 for dnsmasq[1] package on stable release.

I not using dnsmasq but I curious how and will it be backport to stable 
on cases like this?

Stable = 2.80-1 (vulnerable)
Testing = 2.83-1 (fix)
Unstable = 2.84-1 (fix)

There is 2 revision gap between stable and testing, do the security team 
will apply the fixes on 2.80-1 or will update the package rev up to 2.83-1?


1. https://security-tracker.debian.org/tracker/source-package/dnsmasq

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