CVE-2025-20692
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in MediaTek's wlan AP driver that could allow local attackers to read sensitive information from kernel memory. Attackers need user execution privileges but no user interaction. The vulnerability affects devices using MediaTek Wi-Fi chipsets.
💻 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
Local attacker could read sensitive kernel memory, potentially exposing cryptographic keys, passwords, or other system secrets leading to privilege escalation or further attacks.
Likely Case
Local information disclosure where an attacker with user privileges can read portions of kernel memory, potentially exposing some system information but not necessarily achieving full system compromise.
If Mitigated
With proper access controls limiting local user privileges and network segmentation, impact is limited to information disclosure within the compromised user context.
🎯 Exploit Status
Requires local access and user execution privileges; no user interaction needed for exploitation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: WCNCR00418040
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/July-2025
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply MediaTek patch WCNCR00418040. 3. Reboot device after patch installation. 4. Verify patch installation through vendor-specific verification methods.
🔧 Temporary Workarounds
Restrict local user privileges
allLimit user account privileges to reduce attack surface
Disable unnecessary Wi-Fi features
allDisable Wi-Fi Direct, Hotspot, or other advanced Wi-Fi features if not required
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Segment network to isolate potentially vulnerable devices from critical systems
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisories; examine Wi-Fi driver version for MediaTek chipsetsCheck Version:
Device-specific commands vary by manufacturer; check system settings or use manufacturer diagnostic toolsVerify Fix Applied:
Verify patch WCNCR00418040 is installed through vendor-specific update verification tools or firmware version checks📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs related to Wi-Fi driver
- Unusual memory access patterns in system logs
- Wi-Fi driver crash reports
Network Indicators:
- Unusual local network scanning from compromised device
- Abnormal Wi-Fi connection attempts
SIEM Query:
Search for: (event_source:"kernel" AND message:"wlan" AND ("panic" OR "oops" OR "segfault")) OR (process_name:"wpa_supplicant" AND abnormal_behavior)