CVE-2023-32843
📋 TL;DR
This vulnerability in 5G modem firmware allows remote attackers to cause a system crash (denial of service) by sending malformed RRC (Radio Resource Control) messages. No user interaction or special privileges are required for exploitation. Affects devices using MediaTek 5G modem chipsets with vulnerable firmware.
💻 Affected Systems
- MediaTek 5G modem chipsets
📦 What is this software?
Nr15 by Mediatek
Nr16 by Mediatek
Nr17 by Mediatek
⚠️ Risk & Real-World Impact
Worst Case
Permanent device bricking requiring hardware replacement, complete loss of cellular connectivity, and potential cascading failures in network infrastructure.
Likely Case
Temporary denial of service causing device reboot or modem reset, disrupting cellular connectivity until manual restart.
If Mitigated
Minimal impact with proper network filtering and updated firmware preventing malformed RRC messages from reaching vulnerable devices.
🎯 Exploit Status
Requires ability to send malformed RRC messages over cellular network; no public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware with patch ID MOLY01130204
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/December-2023
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware update availability. 2. Apply firmware update containing patch MOLY01130204. 3. Reboot device after update.
🔧 Temporary Workarounds
Network filtering
allImplement network-level filtering of malformed RRC messages at cellular infrastructure level
Airplane mode toggle
allTemporarily disable cellular radio when not in use to reduce attack surface
🧯 If You Can't Patch
- Isolate vulnerable devices from untrusted cellular networks when possible
- Monitor for abnormal modem resets or connectivity disruptions as exploitation indicators
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's patched version list; contact device vendor for specific vulnerability assessment.Check Version:
Device-specific modem firmware check commands vary by manufacturer; consult device documentation.Verify Fix Applied:
Confirm firmware version includes patch ID MOLY01130204; test with legitimate RRC message handling.📡 Detection & Monitoring
Log Indicators:
- Unexpected modem resets
- RRC protocol errors
- 5G connection failures
Network Indicators:
- Malformed RRC messages in network traffic
- Abnormal RRC message patterns
SIEM Query:
Search for modem crash events, RRC protocol violations, or cellular connectivity disruption logs