CVE-2025-20720
📋 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. Attackers can exploit this from adjacent networks without authentication.
💻 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 code execution leading to complete device compromise, data theft, and persistent backdoor installation.
Likely Case
Privilege escalation allowing attackers to gain system-level access and potentially pivot to other network resources.
If Mitigated
Limited impact if network segmentation isolates Wi-Fi networks and devices are patched.
🎯 Exploit Status
Exploitation requires proximity to target Wi-Fi network but no authentication or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: WCNCR00418954
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 patch WCNCR00418954. 3. Update device firmware through manufacturer channels. 4. Reboot device after update.
🔧 Temporary Workarounds
Disable Wi-Fi when not needed
allTurn off Wi-Fi radios to prevent wireless attack surface exposure
Network segmentation
allIsolate Wi-Fi networks from critical internal resources
🧯 If You Can't Patch
- Implement strict network segmentation for Wi-Fi networks
- Monitor for unusual wireless activity and driver crashes
🔍 How to Verify
Check if Vulnerable:
Check device specifications for MediaTek Wi-Fi chipset and firmware version against MediaTek advisoryCheck Version:
Device-specific commands vary by manufacturer; check system settings or use 'dmesg | grep -i mediatek' on Linux systemsVerify Fix Applied:
Verify patch WCNCR00418954 is applied in firmware version and driver version📡 Detection & Monitoring
Log Indicators:
- Wi-Fi driver crashes
- Kernel panic logs
- Unexpected privilege escalation events
Network Indicators:
- Unusual Wi-Fi probe requests
- Malformed Wi-Fi packets targeting driver
SIEM Query:
source="kernel" AND ("wlan" OR "mediatek") AND ("crash" OR "panic" OR "oob")