CVE-2022-20497 in Android
Summary
by MITRE • 12/13/2022
In updatePublicMode of NotificationLockscreenUserManagerImpl.java, there is a possible way to reveal sensitive notifications on the lockscreen due to an incorrect state transition. This could lead to local information disclosure with physical access required and an app that runs above the lockscreen, with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12 Android-12L Android-13Android ID: A-246301979
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Analysis
by VulDB Data Team • 04/18/2026
The vulnerability identified as CVE-2022-20497 resides within the Android notification system's lockscreen management implementation, specifically in the updatePublicMode method of the NotificationLockscreenUserManagerImpl.java component. This flaw represents a critical security weakness that exploits improper state handling during notification display transitions on locked devices. The issue manifests when the system fails to correctly transition notification states, potentially allowing sensitive information to be exposed on the lockscreen interface. The vulnerability affects Android 12, 12L, and 13 versions, indicating it spans multiple generations of the Android operating system's security architecture. According to the Android security advisory A-246301979, this vulnerability requires only physical access to the device and the presence of an application running above the lockscreen to be exploited, making it particularly concerning for mobile device security.
The technical root cause of this vulnerability stems from an incorrect state transition mechanism within the notification lockscreen user manager implementation. When the system processes notifications for display on the lockscreen, it maintains specific state information to determine what content should be visible to users. The flaw occurs during the updatePublicMode operation where the system fails to properly validate or transition between notification display states. This mismanagement allows for a scenario where notifications that should remain private or restricted in visibility can be rendered visible on the lockscreen interface. The vulnerability operates at the system level within the Android framework, specifically affecting how the operating system manages notification visibility states for different user contexts and lockscreen modes. This represents a direct violation of the principle of least privilege and information hiding that should be maintained within mobile operating systems.
The operational impact of CVE-2022-20497 is significant for Android device users, particularly those who rely on lockscreen notifications for sensitive information. Attackers with physical access to a device can exploit this vulnerability to gain unauthorized visibility into sensitive notifications that should remain protected. The attack requires minimal privileges beyond physical access and the presence of an application that can run above the lockscreen, which is often achievable through legitimate system components or malicious applications. This vulnerability effectively undermines the lockscreen security model that Android implements to protect user data, potentially exposing personal communications, financial information, or business-sensitive data. The lack of user interaction requirements makes this vulnerability particularly dangerous as it can be exploited automatically without any user awareness or consent, representing a passive information disclosure threat that can occur during routine device use.
Mitigation strategies for CVE-2022-20497 should focus on both immediate system updates and defensive operational measures. Google has addressed this vulnerability through security patches released as part of Android security updates, and device manufacturers should prioritize deploying these patches to affected devices. Users should ensure their devices are running the latest Android version that includes the fix for this vulnerability. Additionally, organizations implementing mobile device management policies should consider disabling or restricting applications that can run above the lockscreen as a defensive measure. From a cybersecurity perspective, this vulnerability aligns with CWE-200 (Information Exposure) and potentially CWE-310 (Cryptographic Issues) when sensitive data is exposed through improper state management. The attack vector corresponds to ATT&CK technique T1552.001 (Unsecured Credentials) and T1059.001 (Command and Scripting Interpreter), as the vulnerability enables unauthorized data access without requiring complex exploitation techniques. Security teams should monitor for potential exploitation attempts and consider this vulnerability in their risk assessment frameworks for mobile device security, particularly in environments where physical security controls may be insufficient.