CVE-2025-0077 – This CVE describes a lock screen bypass vulnera... (How to Fix)

Q: What is the severity of CVE-2025-0077?

CVE-2025-0077 has a CVSS score of 4.0 (MEDIUM). This CVE describes a lock screen bypass vulnerability in Android's UserController component due to a race condition. It allows local attackers to escalate privileges without user interaction or additional permissions. This affects Android devices with vulnerable versions of the UserController framework.

📋 TL;DR

This CVE describes a lock screen bypass vulnerability in Android's UserController component due to a race condition. It allows local attackers to escalate privileges without user interaction or additional permissions. This affects Android devices with vulnerable versions of the UserController framework.

💻 Affected Systems

Products:

Android operating system

Versions: Specific Android versions referenced in the Git commits (exact range not specified in CVE description)

Operating Systems: Android

Default Config Vulnerable: ⚠️ Yes

Notes: Affects devices with the vulnerable UserController.java implementation. The Git commits suggest this was in the Android framework base.

📦 What is this software?

Android by Google

View all CVEs affecting Android →

⚠️ Risk & Real-World Impact

🔴

Worst Case

An attacker with physical access could bypass the lock screen and gain unauthorized access to the device, potentially accessing sensitive data or installing malware.

🟠

Likely Case

Local privilege escalation allowing access to user data and applications that would normally be protected by the lock screen.

🟢

If Mitigated

With proper patching, the vulnerability is eliminated; without patching, physical security controls can reduce risk.

🌐 Internet-Facing: LOW - This is a local attack requiring physical or local access to the device.

🏢 Internal Only: MEDIUM - Internal users with device access could exploit this, but requires specific conditions and technical knowledge.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires local access and timing precision due to race condition nature. No user interaction needed.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Android security updates containing the referenced Git commits

Vendor Advisory: https://source.android.com/docs/security/bulletin

Restart Required: No

Instructions:

1. Check for Android security updates in device settings. 2. Apply the latest security patch from device manufacturer. 3. Verify the patch includes the referenced Git commit fixes.

🔧 Temporary Workarounds

Enable device encryption

Android

Full device encryption provides additional protection if lock screen is bypassed

Navigate to Settings > Security > Encryption & credentials > Encrypt phone

Use strong authentication methods

Android

Implement biometric authentication or strong PIN/password to add layers of security

Navigate to Settings > Security > Screen lock

🧯 If You Can't Patch

Implement strict physical security controls for devices
Enable remote wipe capabilities and device management policies

🔍 How to Verify

Check if Vulnerable:

Check Android build version and compare with patched versions in security bulletins

Check Version:

adb shell getprop ro.build.version.security_patch

Verify Fix Applied:

Verify the device has received security updates after the Git commit dates (2025 timeframe based on CVE ID)

📡 Detection & Monitoring

Log Indicators:

Multiple rapid UserController service calls
Unexpected lock screen state changes
Security exception logs related to user switching

Network Indicators:

None - this is a local attack

SIEM Query:

source="android_system" AND ("UserController" OR "lock screen") AND ("race" OR "bypass" OR "privilege")

📊 Metadata

CVE ID: CVE-2025-0077

CVSS v3 Score: 4.0 (MEDIUM)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE: CWE-1223

EPSS Score: 0.01% exploit probability (1th percentile)

Published: September 4, 2025

Last Updated: September 5, 2025

🔗 References

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