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How the mentioned CVE works:
The vulnerability exists in the NR modem’s protocol stack software.
It involves improper validation of input parameters during message processing.
Specifically, when handling 5G NR signaling messages like RRC connections.
The modem fails to check bounds or format of certain fields.
This can lead to buffer overflows or null pointer dereferences.
Maliciously crafted information elements in RRC setup messages trigger this.
The modem’s software does not handle exceptions gracefully.
This causes a system crash at the kernel level.
The crash results in a denial of service condition.
The modem may reboot or become unresponsive.
Attackers can exploit this remotely using rogue radio signals.
No authentication or special privileges are required.
Software-defined radios can transmit malicious packets to target devices.
The flaw is in the baseband processor firmware.
Continuous exploitation could cause persistent service disruption.
Improper error handling in input parsing is the root cause.
It primarily causes crashes but may allow arbitrary code execution.
It affects IoT devices and smartphones using 5G connectivity.
The vulnerability highlights insufficient security in telecom software.
A firmware patch from the vendor is required for mitigation.
Platform: NR Modem
Version: Multiple versions
Vulnerability: Improper input validation
Severity: Critical
date: 12/01/2025
Prediction: Expected Q1 2026
What Undercode Say:
Showing bash commands and codes related to the blog
Check modem status
logcat | grep modem
Extract firmware for analysis
binwalk -e firmware.bin
Simulate packet send (example)
hackrf_transfer -t signal.raw -f 3500M -x 47
Monitor system crashes
dmesg | grep panic
Basic vulnerability scan script
for ip in $(seq 1 254); do ping -c 1 192.168.1.$ip; done
how Exploit:
Craft malicious 5G RRC messages.
Transmit via software-defined radio.
Target devices within range.
Cause modem crash reboot.
Repeat for sustained DoS.
Protection from this CVE
Apply vendor firmware updates.
Disable unused radio interfaces.
Monitor network anomaly logs.
Use intrusion detection systems.
Implement input validation checks.
Impact:
Remote denial of service.
Device connectivity loss.
Potential system instability.
Service disruption for users.
May affect critical infrastructure.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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