How severe is CVE-2025-20939?

CVE-2025-20939 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2025-20939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20939?

CVE-2025-20939 affects Samsung Wear Os. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-20939?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-20939 have an EU (EUVD) identifier?

Yes. CVE-2025-20939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10073.

When was CVE-2025-20939 published?

CVE-2025-20939 was published on 2025-04-08 and last updated on 2026-06-17.

CVE-2025-20939

CVE-2025-20939 is a medium-severity vulnerability in Samsung Wear Os with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-10073
Affected product: Samsung Wear Os
Published: 2025-04-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-20939?: CVE-2025-20939 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2025-20939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20939?: CVE-2025-20939 affects Samsung Wear Os. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-20939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-20939 have an EU (EUVD) identifier?: Yes. CVE-2025-20939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10073.
When was CVE-2025-20939 published?: CVE-2025-20939 was published on 2025-04-08 and last updated on 2026-06-17.

References

https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=04

Affected products (1)

cpe:2.3:o:samsung:wear_os:5.0:*:*:*:*:*:*:*

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