Vulnerability in Samsung Galaxy Watch

CVE-2025-20939

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L.

EPSS exploit prediction

EPSS: 0.002 (8.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-20939: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

References

Frequently asked questions

What is CVE-2025-20939?
CVE-2025-20939 is a medium-severity vulnerability in Samsung Galaxy Watch, classified under CWE-347 IMPROPER VERIFICATION OF CRYPTOGRAPHIC SIGNATURE. CVSS score: 5.4/10. Published 2025-04-08.
How severe is CVE-2025-20939?
Medium severity. CVSS v3 base score is 5.4 out of 10.