Evaluate the Safety, Efficacy, and Pharmacokinetics of CRN04894 in Participants With Congenital Adrenal Hyperplasia (TouCAHn)

Inclusion Criteria:

1. Male or female participants ≥18 to 75 years of age at the time of signing theInformed Consent Form (ICF). Participants ≥16 years of age may be included in siteslocated in the United States

2. Classic 21-hydroxylase deficiency

3. On a stable regimen of glucocorticoid replacement (eg, hydrocortisone, prednisolone,prednisone, methylprednisolone)

4. Compliance with glucocorticoid replacement and mineralocorticoid replacement (ifapplicable) regimen during the Screening Period

5. Minimum total daily dose of ≥15 mg hydrocortisone (or equivalent). For Cohort 4, amean daily dose of ≥11 mg/m²/day of hydrocortisone or hydrocortisone equivalentswill be used for inclusion

6. If on estrogen therapy (any route), dose must be stable for at least 3 months priorto Screening

Exclusion Criteria:

1. Diagnosis of any other form of CAH other than classic 21-hydroxylase deficiency

2. Dexamethasone use within 30 days of Screening for Cohorts 1-3. In Cohort 4,dexamethasone is permitted

3. History of bilateral adrenalectomy, hypopituitarism, or other condition requiringchronic glucocorticoid therapy

4. Night shift workers or any other reason for abnormal sleep/wake cycles

5. Clinically significant unstable medical condition or chronic disease other than CAH

6. History of major surgery/surgical therapy for any cause within 4 weeks prior toScreening

7. Diabetes mellitus treated with insulin for less than 6 weeks prior to Screening, orwith change in total daily insulin dose by >15% within 6 weeks prior to Screening

8. Poorly controlled diabetes mellitus defined as having a hemoglobin A1c (HbA1c) ≥8.5%(≥69 mmol/mL), or estimated HbA1c based on fructosamine if HbA1c is notevaluable (eg, due to hemoglobinopathies)

9. Participants with hypothyroidism who are not receiving adequate hormone replacementtherapy based on thyroid hormone levels measured at the time of Screening

10. History of unstable angina or acute myocardial infarction within 12 weeks prior toScreening or other clinically significant cardiac disease at the time of Screening

11. History of cancer excluding cured/treated dermal squamous or basal cell carcinoma orcervical carcinoma in situ

12. Pregnant or lactating

13. Known history of illicit drug or alcohol abuse within the last year

14. Use of antiandrogen therapy in the past 3 months (eg, spironolactone, finasteride,cyproterone acetate, flutamide)

15. Use of testosterone, androgen-containing supplements, aromatase inhibitors, orgrowth hormone