CVE-2025-20678 – This vulnerability in MediaTek's IMS service al... (How to Fix)

Q: What is the severity of CVE-2025-20678?

CVE-2025-20678 has a CVSS score of 6.5 (MEDIUM). This vulnerability in MediaTek's IMS service allows remote denial of service attacks when a user equipment (UE) connects to a malicious base station. Attackers can crash the system without user interaction or special privileges. This affects devices using MediaTek chipsets with vulnerable IMS implementations.

📋 TL;DR

This vulnerability in MediaTek's IMS service allows remote denial of service attacks when a user equipment (UE) connects to a malicious base station. Attackers can crash the system without user interaction or special privileges. This affects devices using MediaTek chipsets with vulnerable IMS implementations.

💻 Affected Systems

Products:

MediaTek chipsets with IMS service

Versions: Specific versions not publicly disclosed in CVE description

Operating Systems: Android-based systems using MediaTek chipsets

Default Config Vulnerable: ⚠️ Yes

Notes: Requires connection to rogue base station; affects mobile devices with MediaTek chipsets

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system crash and service disruption for affected mobile devices, potentially requiring physical restart or factory reset.

🟠

Likely Case

Temporary service disruption and device instability when connecting to rogue base stations in targeted attacks.

🟢

If Mitigated

Limited impact with proper network segmentation and base station authentication controls in place.

🌐 Internet-Facing: MEDIUM

🏢 Internal Only: LOW

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Requires attacker to control a rogue base station; no user interaction needed

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Patch ID: MOLY01394606

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

Restart Required: Yes

Instructions:

1. Check MediaTek security bulletin for device-specific patches. 2. Apply firmware updates from device manufacturer. 3. Reboot device after update.

🔧 Temporary Workarounds

Disable automatic network switching

android

Prevent devices from automatically connecting to unknown base stations

Enable base station authentication

all

Configure devices to only connect to authenticated base stations

🧯 If You Can't Patch

Implement network monitoring for rogue base station detection
Restrict device connectivity to trusted networks only

🔍 How to Verify

Check if Vulnerable:

Check device firmware version against MediaTek security bulletin; devices with unpatched IMS service are vulnerable

Check Version:

Check device settings > About phone > Build number

Verify Fix Applied:

Verify patch MOLY01394606 is applied in device firmware version

📡 Detection & Monitoring

Log Indicators:

IMS service crash logs
Unexpected base station connection attempts
System stability issues

Network Indicators:

Connections to unauthorized base stations
Unusual IMS protocol traffic patterns

SIEM Query:

source="device_logs" AND (event="ims_crash" OR event="base_station_auth_fail")

📊 Metadata

CVE ID: CVE-2025-20678

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-674

EPSS Score: 0.15% exploit probability (36.2th percentile)

Published: June 2, 2025

Last Updated: February 17, 2026

🔗 References

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

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🔗 Related Vulnerabilities

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