CVE-2025-20646
📋 TL;DR
This critical vulnerability in MediaTek WLAN AP firmware allows remote attackers to execute arbitrary code without authentication or user interaction. It affects devices using vulnerable MediaTek wireless chipsets, potentially including routers, IoT devices, and embedded systems. Attackers can exploit this to gain full control of affected devices.
💻 Affected Systems
- MediaTek WLAN AP firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full system control, installs persistent malware, pivots to internal networks, and creates botnet nodes for DDoS or cryptomining.
Likely Case
Remote code execution leading to device compromise, credential theft, network surveillance, and lateral movement within the network.
If Mitigated
If network segmentation and strict firewall rules are in place, impact may be limited to the wireless segment, though device compromise still occurs.
🎯 Exploit Status
No authentication required and no user interaction needed makes this highly exploitable. CVSS 9.8 indicates trivial exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: WCNCR00389074
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/March-2025
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware update 2. Apply patch WCNCR00389074 3. Reboot device 4. Verify firmware version
🔧 Temporary Workarounds
Disable WLAN AP functionality
allTurn off wireless access point mode if not required
Device-specific commands vary by manufacturer
Network segmentation
allIsolate affected devices in separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Segment affected devices in isolated network with no internet access
- Implement strict network monitoring and IDS/IPS rules for anomalous wireless traffic
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's patched version listCheck Version:
Device-specific command (usually via web interface or CLI)Verify Fix Applied:
Verify firmware version includes patch WCNCR00389074📡 Detection & Monitoring
Log Indicators:
- Unusual wireless authentication failures
- Firmware modification logs
- Unexpected process execution
Network Indicators:
- Anomalous wireless management frames
- Unexpected outbound connections from AP
- Port scanning from AP
SIEM Query:
Example: 'wireless AND (buffer_overflow OR oob_write OR privilege_escalation)'