CVE-2024-25290
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Casa Systems NL1901ACV VDSL modems by exploiting improper input validation in the userName parameter of the add function. Attackers can gain full control of affected devices without authentication. This affects all users of NL1901ACV modems running vulnerable firmware versions.
💻 Affected Systems
- Casa Systems NL1901ACV VDSL Modem
⚠️ 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
Complete device compromise allowing attackers to install persistent malware, intercept all network traffic, pivot to internal networks, and use the device as part of botnets or for further attacks.
Likely Case
Device takeover leading to network monitoring, credential theft, DNS hijacking, and participation in DDoS attacks or cryptocurrency mining.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation, though lateral movement risk remains if exploited.
🎯 Exploit Status
The vulnerability requires no authentication and has publicly available technical details, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates
2. Download latest firmware
3. Access modem web interface
4. Navigate to firmware update section
5. Upload and apply new firmware
6. Reboot device
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface from WAN/Internet-facing side
Network Segmentation
allPlace modem in isolated network segment with strict firewall rules
🧯 If You Can't Patch
- Replace vulnerable devices with supported models from different vendors
- Implement strict network access controls and monitor for suspicious traffic
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at http://[modem-ip]/ or using nmap scan for device identificationCheck Version:
curl -s http://[modem-ip]/ | grep -i firmwareVerify Fix Applied:
Verify firmware version has been updated to a version later than R6B032📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to add function with malicious userName parameters
- Unexpected process execution or system modifications
Network Indicators:
- Suspicious outbound connections from modem
- Unexpected traffic patterns
- DNS queries to malicious domains
SIEM Query:
source="modem_logs" AND (uri="/add" OR method="POST") AND userAgent CONTAINS "malicious"