Vitrimers, a new class of covalent adaptable materials have been developed to reprocess thermosets. Similar to thermosets, vitrimers form crosslinks on curing. These crosslinks can undergo exchange reactions under the influence of heat and pressure allowing the vitrimer to flow or stress relax. Taking advantage of the hydroxyl and ester groups within an epoxy matrix, a suitable catalyst can promote transesterification and thus, rearrange the network topology. Cellulose nanocrystals (CNC) have been used as a biobased filler in multiple works to reinforce composites as they have excellent properties such as high aspect ratio, high tensile strength, and large surface area. Usually, the addition of a filler physically hinders the network disrupting the topology rearrangement process and decreasing the rate of stress relaxation. An advantage of using CNC as a filler in vitrimers is the availability of OH groups on the cellulose surface. These hydroxyl groups can participate in the dynamic transesterification reaction ideally allowing for faster stress relaxation times. Through this work, we attempt to answer two major questions: 1) Can the hydroxyl groups on the CNC surface overcome the hindering effect of the filler? 2) Would grafting epoxy groups on CNC and their subsequent reaction with the hardener affect network topology and its stress relaxation? This work provides further insight into the filler-vitrimer exchange mechanism by studying the activation energy, topology rearrangement temperature and stress relaxation times for different concentrations and different degrees of dispersion of CNC. This work has practical significance to help reprocess vitrimer nanocomposites at lower temperatures.