CVE-2025-21080: Samsung Android Privilege Escalation Flaw

CVE-2025-21080 Overview

CVE-2025-21080 is a high-severity vulnerability affecting Samsung Android devices through the Dynamic Lockscreen application. The vulnerability stems from improper export of Android application components, which allows local attackers to access files with Dynamic Lockscreen's elevated privileges. This security flaw could enable unauthorized access to sensitive data and potentially compromise device security.

The vulnerability has a CVSS 3.1 score of 7.1 (HIGH), with the vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N, indicating local attack vector, low attack complexity, and high impact on confidentiality and integrity.

Critical Impact

Local attackers can exploit improperly exported Android components in Dynamic Lockscreen to access protected files with elevated privileges, potentially compromising sensitive user data and device integrity.

Affected Products

• Samsung Android 15.0 (all SMR releases prior to December 2025)
• Samsung Android 16.0 (all SMR releases prior to December 2025)
• Samsung devices running Dynamic Lockscreen prior to SMR Dec-2025 Release 1

Discovery Timeline

• December 2, 2025 - CVE-2025-21080 published to NVD
• December 5, 2025 - Last updated in NVD database

Technical Details for CVE-2025-21080

Vulnerability Analysis

The vulnerability exists in Samsung's Dynamic Lockscreen application, a feature that provides customizable lock screen wallpapers and themes on Samsung Android devices. The core issue lies in the improper export of Android application components, specifically related to how the application declares its components in the Android manifest.

In Android, application components (Activities, Services, Broadcast Receivers, and Content Providers) can be declared as "exported" in the manifest file. When a component is improperly exported without proper permission restrictions, other applications on the device can interact with it, potentially gaining access to functionality or data that should be restricted.

The EPSS (Exploit Prediction Scoring System) data indicates a probability of 0.013% with a percentile of 1.702, suggesting relatively low exploitation likelihood in the wild at present.

Root Cause

The root cause of CVE-2025-21080 is the improper configuration of exported components within the Dynamic Lockscreen application. When Android components are exported without appropriate access controls or signature-level permissions, they become accessible to any application installed on the device.

In this case, the Dynamic Lockscreen application runs with elevated privileges to manage lock screen functionality and access various system resources. The improperly exported components allow local attackers to leverage these privileges to access files that should be protected, effectively bypassing the Android security model's application sandboxing.

Attack Vector

This vulnerability requires local access to the device, meaning an attacker would need to have an application installed on the target Samsung device. The attack flow involves:

1. A malicious application identifies the improperly exported component in Dynamic Lockscreen
2. The malicious app sends an intent or interacts with the exported component
3. Dynamic Lockscreen processes the request using its elevated privileges
4. The attacker gains access to files or data that would normally be inaccessible to their application

The local attack vector with low complexity and no user interaction required makes this vulnerability particularly concerning for devices with untrusted applications installed.

Detection Methods for CVE-2025-21080

Indicators of Compromise

• Unexpected inter-process communication (IPC) activity targeting Dynamic Lockscreen components
• Unusual file access patterns originating from the Dynamic Lockscreen process
• Third-party applications attempting to bind to or start Dynamic Lockscreen services
• Anomalous intent broadcasts targeting Dynamic Lockscreen receivers

Detection Strategies

Organizations can implement several detection strategies to identify potential exploitation attempts:

Application Behavior Monitoring: Deploy mobile threat defense solutions that monitor inter-application communication patterns. Unusual IPC activity targeting system applications like Dynamic Lockscreen should trigger alerts.

Log Analysis: Review Android system logs for suspicious activity involving the Dynamic Lockscreen package. Look for unexpected component invocations, particularly from untrusted applications.

File Access Auditing: Monitor file system access patterns for the Dynamic Lockscreen process, looking for access to files outside its normal operational scope.

Intent Monitoring: Implement detection for suspicious intents being sent to Dynamic Lockscreen components from third-party applications.

Monitoring Recommendations

Security teams should implement continuous monitoring for Samsung device fleets:

1. Deploy mobile device management (MDM) solutions with threat detection capabilities
2. Enable detailed logging on managed devices to capture IPC activity
3. Implement network-based detection for data exfiltration attempts
4. Regularly audit installed applications for potential malicious behavior
5. Monitor for indicators of privilege escalation or sandbox escape attempts

How to Mitigate CVE-2025-21080

Immediate Actions Required

• Update affected Samsung devices to SMR Dec-2025 Release 1 or later immediately
• Audit installed applications and remove any untrusted or suspicious apps
• Enable Samsung Knox security features for enhanced device protection
• Implement mobile device management (MDM) policies to restrict app installations from unknown sources
• Review device permissions and revoke unnecessary privileges from installed applications

Patch Information

Samsung has addressed this vulnerability in the SMR Dec-2025 Release 1 security update. The patch information is available in Samsung's official security advisory at:

Vendor Advisory:Samsung Mobile Security - December 2025

Affected versions include:

• Samsung Android 15.0 with any SMR release prior to Dec-2025 Release 1
• Samsung Android 16.0 with any SMR release prior to Dec-2025 Release 1

System administrators should prioritize deployment of this security update across their managed Samsung device fleet.

Workarounds

While awaiting the security patch deployment, organizations can implement the following temporary mitigations:

1. Restrict Application Installation: Configure devices to only allow application installation from trusted sources such as the Google Play Store and Samsung Galaxy Store

2. Enable Knox Container: For enterprise environments, utilize Samsung Knox to isolate work data and applications from personal apps that might exploit this vulnerability

3. Application Vetting: Implement strict application vetting procedures before allowing installation on corporate devices

4. User Awareness: Educate users about the risks of installing applications from unknown sources and the importance of keeping devices updated

Note that these workarounds reduce risk but do not fully remediate the vulnerability. Applying the official Samsung security update remains the recommended solution.