CVE-2025-20633
📋 TL;DR
This vulnerability in MediaTek wlan AP driver allows remote attackers within wireless range to execute arbitrary code without authentication or user interaction. It affects devices using MediaTek Wi-Fi chipsets with vulnerable driver versions. Attackers can exploit this to gain full control of affected devices.
💻 Affected Systems
- MediaTek Wi-Fi chipsets with wlan AP driver
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker within wireless range gains full system control, installs malware, creates persistent backdoors, and pivots to other network resources.
Likely Case
Attackers exploit to install crypto-miners, botnet clients, or ransomware on vulnerable devices within wireless range.
If Mitigated
With network segmentation and strict wireless access controls, impact limited to isolated network segments.
🎯 Exploit Status
No authentication required; attacker needs to be within wireless range of target device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: WCNCR00400889
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/February-2025
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply MediaTek patch WCNCR00400889. 3. Reboot device after patching. 4. Verify patch installation.
🔧 Temporary Workarounds
Disable vulnerable Wi-Fi interfaces
LinuxTemporarily disable Wi-Fi AP functionality on affected devices
sudo ifconfig wlan0 down
sudo systemctl stop hostapd
Restrict wireless network access
allImplement MAC address filtering and reduce wireless transmit power
🧯 If You Can't Patch
- Segment wireless networks from critical infrastructure
- Implement network monitoring for suspicious wireless traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check driver version against patch WCNCR00400889; consult device manufacturer for specific version information.Check Version:
Device-specific; typically via manufacturer's firmware update utility or system settings.Verify Fix Applied:
Verify patch WCNCR00400889 is applied through device firmware version or driver version check.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Driver crash reports
- Unexpected memory access errors in system logs
Network Indicators:
- Unusual wireless protocol anomalies
- Malformed Wi-Fi frames targeting MediaTek devices
SIEM Query:
source="kernel" AND ("wlan" OR "mediatek") AND ("panic" OR "oops" OR "segfault")