CVE-2025-20709
📋 TL;DR
This vulnerability in MediaTek WLAN AP drivers allows attackers within wireless range to execute arbitrary code or escalate privileges without user interaction. It affects devices using vulnerable MediaTek Wi-Fi chipsets, potentially including smartphones, routers, IoT devices, and embedded systems.
💻 Affected Systems
- Devices with MediaTek WLAN AP drivers
📦 What is this software?
Openwrt by Openwrt
Openwrt by Openwrt
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker within wireless range gains full system control, installs persistent malware, or bricks the device.
Likely Case
Attacker within proximity gains elevated privileges, accesses sensitive data, or uses device as pivot point in network.
If Mitigated
With network segmentation and strict access controls, impact limited to isolated wireless segment.
🎯 Exploit Status
Exploitation requires proximity to target device but no authentication or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: WCNCR00415809
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/October-2025
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware update. 2. Apply patch WCNCR00415809. 3. Reboot device after update.
🔧 Temporary Workarounds
Disable Wi-Fi
allTemporarily disable wireless functionality to prevent exploitation
adb shell svc wifi disable
nmcli radio wifi off
Restrict Wi-Fi networks
allOnly connect to trusted, secured networks with MAC filtering
🧯 If You Can't Patch
- Segment wireless network from critical systems
- 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:
Device-specific (e.g., 'cat /proc/version' on Linux, Settings > About on Android)Verify Fix Applied:
Verify patch WCNCR00415809 is applied via firmware version check📡 Detection & Monitoring
Log Indicators:
- Unusual driver crashes
- Kernel panic logs
- Unexpected privilege escalation
Network Indicators:
- Suspicious Wi-Fi probe requests
- Unexpected network traffic from wireless interfaces
SIEM Query:
source="kernel" AND ("wlan" OR "mediatek") AND ("panic" OR "oops" OR "segfault")