CVE-2025-20939: Samsung Wear OS

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper authorization in wireless download protocol in Galaxy Watch prior to SMR Apr-2025 Release 1 allows physical attackers to update device unique identifier of Watch devices.

Affected products

• Samsung Wear OS: version 5.0 only

Published 2025-04-08. Last modified 2026-06-17.