CVE-2025-20757 – This vulnerability in MediaTek modems allows re... (How to Fix)

Q: What is the severity of CVE-2025-20757?

CVE-2025-20757 has a CVSS score of 6.5 (MEDIUM). This vulnerability in MediaTek modems allows remote denial of service through improper input validation. An attacker can crash the system by connecting a device to a rogue base station, requiring no user interaction or special privileges. This affects devices using vulnerable MediaTek modem chipsets.

📋 TL;DR

This vulnerability in MediaTek modems allows remote denial of service through improper input validation. An attacker can crash the system by connecting a device to a rogue base station, requiring no user interaction or special privileges. This affects devices using vulnerable MediaTek modem chipsets.

💻 Affected Systems

Products:

MediaTek modem chipsets

Versions: Specific versions not publicly detailed in advisory

Operating Systems: Android and other OS using MediaTek modems

Default Config Vulnerable: ⚠️ Yes

Notes: Affects devices with vulnerable MediaTek modem firmware; exact device models not specified in public advisory.

📦 What is this software?

Nr15 by Mediatek

View all CVEs affecting Nr15 →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete device/system crash requiring physical restart, potentially disrupting critical communications and services.

🟠

Likely Case

Temporary service disruption and device instability requiring reboot, affecting cellular connectivity.

🟢

If Mitigated

Minimal impact with proper network segmentation and rogue base station detection in place.

🌐 Internet-Facing: HIGH - Attack can be triggered remotely via cellular networks without authentication.

🏢 Internal Only: LOW - Requires cellular network access, not typical internal network vectors.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Requires attacker to operate rogue base station, which requires specialized equipment and knowledge.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Patch ID: MOLY01673751

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

Restart Required: Yes

Instructions:

1. Contact device manufacturer for firmware updates. 2. Apply modem firmware patch MOLY01673751. 3. Reboot device after update.

🔧 Temporary Workarounds

Disable automatic network switching

all

Prevent devices from connecting to unknown base stations

Use trusted networks only

all

Configure devices to connect only to pre-approved cellular networks

🧯 If You Can't Patch

Implement network monitoring for rogue base station detection
Isolate critical devices from untrusted cellular networks

🔍 How to Verify

Check if Vulnerable:

Check modem firmware version against vendor advisory; contact device manufacturer for specific vulnerability status.

Check Version:

Device-specific commands vary; typically in Android: Settings > About Phone > Baseband version

Verify Fix Applied:

Verify modem firmware has been updated to include patch MOLY01673751.

📡 Detection & Monitoring

Log Indicators:

Unexpected modem resets
Baseband processor crashes
Cellular connection drops

Network Indicators:

Devices connecting to unknown base stations
Unusual cellular network behavior

SIEM Query:

Search for modem/baseband crash events or unexpected cellular disconnections

📊 Metadata

CVE ID: CVE-2025-20757

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-617

Published: December 2, 2025

Last Updated: February 17, 2026

🔗 References

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

📤 Share & Export

📄 Export Markdown 📋 Export JSON

🔗 Related Vulnerabilities

If you're affected by CVE-2025-20757, you might also want to check these: