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Exynos chipsets contain the Samsung-designed modems with problems. Qualcomm's Snapdragon chipsets use integrated Qualcomm-designed modems (usually) that should be safe (from this vulnerability).

If you still have the box or possibly a receipt, Exynos S22Us have the model number SM-S908B or SM-S908B/DS. Every other model is Snapdragon.

If you just have the phone itself, try the Geekbench or CPU-Z apps. They're benchmarking apps for the most part, but they also contain pretty detailed hardware reports.

It has been a while since I used Android, but I believe you can view the model number in the About section in the Settings app?

CPU-Z, the Android app, can tell you this (along with a bunch of other information that you might find useful)

You do have this chipset.

To confirm you can install AIDA64 from the Play Store.