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Cyber Security Agency of Singapore
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High-Severity Vulnerability in Samsung Android Devices

15 September 2025

Samsung has released security updates addressing a high-severity zero-day vulnerability in Samsung devices. Users of affected product versions are strongly advised to update to the latest versions immediately.

Background

Samsung has released security updates addressing a high-severity, that of an out-of-bounds write vulnerability, (CVE-2025-21043) in their Android products.

Impact

Successful exploitation of the out-of-bounds write vulnerability could allow an unauthenticated attacker to execute malicious code on a vulnerable device remotely. 

Known Exploitation

The vulnerability is reportedly being observed in actual cyber incidents.

Affected products

The vulnerability affects Samsung devices using Android 13, 14, 15 and 16.

Mitigation

Users of affected product versions are strongly advised to update to the latest versions immediately.

References

https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=09

https://nvd.nist.gov/vuln/detail/CVE-2025-21043

https://thehackernews.com/2025/09/samsung-fixes-critical-zero-day-cve.html


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