CVE-2025-41766
📋 TL;DR
A low-privileged remote attacker can exploit a stack-based buffer overflow vulnerability in the ubr-network method via crafted HTTP POST requests, leading to arbitrary code execution and full device compromise. This affects systems running vulnerable software with exposed HTTP interfaces. Attackers can gain complete control over affected devices.
💻 Affected Systems
- Specific product information not provided in reference - likely network/embedded device software
⚠️ 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
Full device compromise with root/system privileges, allowing persistent backdoor installation, data theft, and lateral movement within the network.
Likely Case
Remote code execution leading to device takeover, credential harvesting, and deployment of malware or ransomware.
If Mitigated
Denial of service or application crash if exploit fails, but successful exploitation still leads to compromise.
🎯 Exploit Status
Low-privileged remote exploitation suggests straightforward attack vectors. CVSS 8.8 indicates high exploitability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - check vendor advisory
Vendor Advisory: https://www.mbs-solutions.de/mbs-2025-0001
Restart Required: Yes
Instructions:
1. Monitor vendor advisory for patches. 2. Apply security updates when available. 3. Restart affected services/devices after patching.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict access to HTTP interfaces using firewall rules
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable ubr-network Method
allIf possible, disable or restrict the vulnerable HTTP method
Check application configuration for method restrictions
🧯 If You Can't Patch
- Implement strict network access controls to limit HTTP interface exposure
- Deploy web application firewall (WAF) with buffer overflow protection rules
🔍 How to Verify
Check if Vulnerable:
Check if system responds to HTTP POST requests on ubr-network endpoint. Use vulnerability scanner or manual testing with caution.Check Version:
Check application version via vendor-specific commands or web interfaceVerify Fix Applied:
Test that crafted POST requests to ubr-network endpoint no longer cause buffer overflow or service crashes.📡 Detection & Monitoring
Log Indicators:
- Multiple HTTP POST requests to ubr-network endpoint
- Application crashes or abnormal termination
- Unusual process execution following POST requests
Network Indicators:
- HTTP POST requests with oversized or malformed payloads to ubr-network path
- Unusual outbound connections from affected device
SIEM Query:
source="web_logs" AND (method="POST" AND uri="/ubr-network" AND (content_length>threshold OR contains(content,"malformed_pattern")))