CVE-2025-20730
📋 TL;DR
This vulnerability allows local privilege escalation on MediaTek devices due to an insecure default value in the preloader component. An attacker with System privilege can exploit this to gain higher privileges without user interaction. Affects MediaTek-based Android devices using vulnerable preloader versions.
💻 Affected Systems
- MediaTek-based Android devices
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
Openwrt by Openwrt
Openwrt by Openwrt
Rdk B by Rdkcentral
Yocto by Linuxfoundation
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, bypass security controls, and access all user data.
Likely Case
Local attacker gains elevated privileges to modify system files, install unauthorized apps, or access protected data.
If Mitigated
Limited impact if device is fully patched and has secure boot enabled with verified boot chain.
🎯 Exploit Status
Requires System privilege as prerequisite; exploitation involves manipulating preloader configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: ALPS10068463
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/November-2025
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply latest security patch from device OEM. 3. Reboot device after update. 4. Verify patch installation through device settings.
🔧 Temporary Workarounds
Disable developer options and USB debugging
androidReduces attack surface by limiting debugging interfaces that could be used to gain initial System privilege.
Settings > Developer options > Toggle off
Enable verified boot
androidEnsures boot chain integrity verification to detect unauthorized modifications.
Settings > Security > Enable verified boot
🧯 If You Can't Patch
- Restrict physical access to devices and implement device control policies
- Monitor for suspicious privilege escalation attempts using security monitoring tools
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in Settings > About phone > Android security patch level. Contact device manufacturer for specific vulnerability assessment.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level includes November 2025 or later MediaTek patches. Check for patch ID ALPS10068463 in firmware details.📡 Detection & Monitoring
Log Indicators:
- Unexpected preloader modifications
- Unauthorized privilege escalation attempts
- Secure boot violations
Network Indicators:
- None - local exploitation only
SIEM Query:
Device logs showing privilege escalation from System to higher privileges or preloader modification events