CVE-2025-31717
📋 TL;DR
This vulnerability in modem firmware allows remote attackers to cause a system crash through improper input validation, leading to denial of service. It affects systems using Unisoc modem chipsets and requires no authentication or special privileges to exploit.
💻 Affected Systems
- Unisoc modem chipsets
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Permanent modem failure requiring hardware replacement or complete system reboot, disrupting all cellular connectivity.
Likely Case
Temporary modem crash requiring system reboot to restore cellular connectivity.
If Mitigated
Limited impact with proper network segmentation and input validation at higher layers.
🎯 Exploit Status
Remote exploitation possible without authentication; specific exploit details not publicly available
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in public advisory
Vendor Advisory: https://www.unisoc.com/en/support/announcement/1976557615080263681
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Apply modem firmware patch. 3. Reboot device to activate new firmware.
🔧 Temporary Workarounds
Network Segmentation
allIsolate modem interfaces from untrusted networks
Input Filtering
linuxImplement packet filtering for modem communication
iptables -A INPUT -p tcp --dport [modem_port] -j DROP
iptables -A INPUT -p udp --dport [modem_port] -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate modem interfaces
- Deploy intrusion detection systems to monitor for modem crash attempts
🔍 How to Verify
Check if Vulnerable:
Check modem firmware version against manufacturer's advisory; contact device vendor for specific vulnerability assessmentCheck Version:
adb shell getprop | grep modem (for Android devices) or manufacturer-specific modem query commandsVerify Fix Applied:
Verify modem firmware has been updated to patched version; test modem stability with various inputs📡 Detection & Monitoring
Log Indicators:
- Modem crash logs
- Unexpected modem resets
- Cellular connectivity loss events
Network Indicators:
- Unusual traffic patterns to modem ports
- Malformed packets targeting modem interfaces
SIEM Query:
source="modem_logs" AND (event="crash" OR event="reset" OR event="failure")