CVE-2025-20711
📋 TL;DR
This vulnerability in MediaTek wlan AP driver allows remote attackers within wireless range to execute arbitrary code or escalate privileges without user interaction. It affects devices using MediaTek Wi-Fi chipsets with vulnerable driver versions. Exploitation could lead to complete device compromise.
💻 Affected Systems
- MediaTek Wi-Fi chipsets with wlan AP driver
📦 What is this software?
Openwrt by Openwrt
Openwrt by Openwrt
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker within Wi-Fi range gains full system control, installs persistent malware, accesses sensitive data, and pivots to other network resources.
Likely Case
Attacker gains kernel-level privileges, installs backdoors, intercepts network traffic, and potentially bricks the device.
If Mitigated
With network segmentation and strict Wi-Fi security, impact limited to isolated network segments with minimal critical assets.
🎯 Exploit Status
No public exploit available yet, but vulnerability is remotely exploitable without authentication. Requires proximity to target Wi-Fi network.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: WCNCR00422399
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/October-2025
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Apply MediaTek-provided patch WCNCR00422399. 3. Update device firmware through official channels. 4. Reboot device after update.
🔧 Temporary Workarounds
Disable Wi-Fi
android/linuxTemporarily disable Wi-Fi functionality to prevent remote exploitation
adb shell svc wifi disable
nmcli radio wifi off
Restrict Wi-Fi Networks
allConfigure devices to only connect to trusted, secured Wi-Fi networks
🧯 If You Can't Patch
- Segment vulnerable devices on isolated network VLANs
- Implement strict network access controls and monitor for suspicious Wi-Fi activity
🔍 How to Verify
Check if Vulnerable:
Check device specifications for MediaTek Wi-Fi chipset and firmware version against vendor advisoryCheck Version:
adb shell getprop ro.build.fingerprint (Android) or dmesg | grep -i mediatek (Linux)Verify Fix Applied:
Verify patch WCNCR00422399 is applied through device firmware version check📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Wi-Fi driver crash reports
- Unexpected privilege escalation events
Network Indicators:
- Unusual Wi-Fi probe requests
- Suspicious MAC addresses in proximity
- Anomalous network traffic from IoT devices
SIEM Query:
source="kernel" AND "panic" AND "wlan" OR source="wifi" AND "driver" AND "crash"