Could well be under extrusion, but also check........

Nozzle for any clogs.
Extruder for any signs of clogged teeth, usually particles of filament scattered around from filament grinding.
Filamant route to extruder for possible snagging.

I don't use Cura but there is a setting in Prusa slicer for extrusion multiplier where you can adjust the extrusion in increments between 0.9 and 1.1, might be something similar in Cura