CVE-2025-20672
📋 TL;DR
This CVE describes a critical Bluetooth driver vulnerability in MediaTek chipsets where an incorrect bounds check allows out-of-bounds write. Attackers with local access can exploit this to escalate privileges without user interaction. Affects devices using vulnerable MediaTek Bluetooth drivers.
💻 Affected Systems
- MediaTek Bluetooth drivers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with kernel-level code execution, allowing attackers to install persistent malware, steal sensitive data, or disable security controls.
Likely Case
Local privilege escalation to SYSTEM/root privileges, enabling installation of additional malware, credential theft, or lateral movement.
If Mitigated
Limited impact if Bluetooth is disabled or device uses strict application sandboxing and kernel protections.
🎯 Exploit Status
Exploitation requires local access but no user interaction. The vulnerability is in a driver, making reliable exploitation likely straightforward for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: WCNCR00412257
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/June-2025
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply MediaTek-provided patch WCNCR00412257. 3. Reboot device after patching. 4. Verify Bluetooth functionality post-patch.
🔧 Temporary Workarounds
Disable Bluetooth
allTemporarily disable Bluetooth to prevent exploitation until patched
adb shell settings put global bluetooth_on 0
systemctl stop bluetooth
rfkill block bluetooth
Restrict Bluetooth permissions
androidLimit which apps/services can use Bluetooth to reduce attack surface
🧯 If You Can't Patch
- Disable Bluetooth completely on affected devices
- Implement strict network segmentation to isolate vulnerable devices
🔍 How to Verify
Check if Vulnerable:
Check Bluetooth driver version against MediaTek advisory. On Android: adb shell dmesg | grep -i mediatek. On Linux: modinfo btmtk or check kernel logs.Check Version:
adb shell getprop ro.build.fingerprint or cat /proc/versionVerify Fix Applied:
Verify patch WCNCR00412257 is applied via firmware version check. Confirm Bluetooth driver version is updated.📡 Detection & Monitoring
Log Indicators:
- Kernel panic or crash logs related to Bluetooth driver
- Unexpected privilege escalation events
- Abnormal Bluetooth service restarts
Network Indicators:
- Unusual Bluetooth pairing attempts from unauthorized devices
- Suspicious Bluetooth traffic patterns
SIEM Query:
source="kernel" AND "bluetooth" AND ("panic" OR "oops" OR "segfault")