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CVE-2025-20694

6.5 MEDIUM
Denial of Service

📋 TL;DR

This vulnerability in MediaTek Bluetooth firmware allows remote attackers to cause a system crash via an uncaught exception, leading to denial of service without requiring user interaction or special privileges. It affects devices using vulnerable MediaTek Bluetooth chipsets.

💻 Affected Systems

Products:
  • MediaTek Bluetooth chipsets
Versions: Specific firmware versions not specified in CVE
Operating Systems: Android, Linux-based IoT devices
Default Config Vulnerable: ⚠️ Yes
Notes: Affects devices with Bluetooth enabled; exact chipset models not specified in CVE description

📦 What is this software?

Android by Google

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Android by Google

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Android by Google

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Openwrt by Openwrt

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Openwrt by Openwrt

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Software Development Kit by Mediatek

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Permanent device bricking requiring hardware replacement if firmware corruption occurs during crash

🟠

Likely Case

Temporary system crash requiring manual reboot, disrupting Bluetooth functionality

🟢

If Mitigated

Minor service interruption with automatic recovery if system has robust crash handling

🌐 Internet-Facing: MEDIUM - Requires Bluetooth proximity but no authentication
🏢 Internal Only: MEDIUM - Same attack vector applies within physical range

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

No user interaction required, attacker needs to be within Bluetooth range (~10m)

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firmware with Patch ID: ALPS09752821

Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/July-2025

Restart Required: Yes

Instructions:

1. Contact device manufacturer for firmware update 2. Apply MediaTek-provided patch 3. Reboot device 4. Verify Bluetooth functionality

🔧 Temporary Workarounds

Disable Bluetooth

all

Turn off Bluetooth when not in use to prevent exploitation

adb shell settings put global bluetooth_on 0
rfkill block bluetooth

Reduce Bluetooth Visibility

linux

Set Bluetooth to non-discoverable mode

hciconfig hci0 noscan

🧯 If You Can't Patch

  • Implement network segmentation to isolate Bluetooth devices
  • Use physical security controls to limit Bluetooth proximity access

🔍 How to Verify

Check if Vulnerable:

Check device specifications for MediaTek Bluetooth chipset and firmware version

Check Version:

dmesg | grep -i bluetooth

Verify Fix Applied:

Verify patch ALPS09752821 is applied via firmware version check

📡 Detection & Monitoring

Log Indicators:

  • Bluetooth stack crashes
  • Kernel panic messages
  • Unexpected Bluetooth disconnections

Network Indicators:

  • Unusual Bluetooth pairing attempts
  • Malformed Bluetooth packets

SIEM Query:

source="bluetooth" AND (event="crash" OR event="panic")

📊 Metadata

CVE ID: CVE-2025-20694
CVSS v3 Score: 6.5 (MEDIUM)
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-124
EPSS Score: 0.03% exploit probability (9.2th percentile)
Published: July 8, 2025
Last Updated: July 14, 2025

🔗 References

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