The purpose of this study is to evaluate the safety, tolerability, and pharmacokinetics of single dose of VX-581 and multiple ascending doses of VX-581 alone and in combination with tezacaftor (TEZ)/deutivacaftor (D-IVA) or D-IVA in healthy participants. The study will also evaluate the safety, tolerability, and pharmacokinetics of VX-581 administered in combination with D-IVA with or without TEZ in participants with cystic fibrosis (CF).
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Key Inclusion Criteria: * Parts A, B, C: * Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m\^2) * A total body weight of more than (\>) 50 kg * Part D: * Confirmed diagnosis of CF Key Exclusion Criteria: * Parts A, B, C: * History of febrile illness or other acute illness that has not fully resolved within 14 days before the first dose of study drug * Any condition possibly affecting drug absorption * Part D: * History of clinically significant cirrhosis with or without portal hypertension. Other protocol defined Inclusion/Exclusion criteria may apply.