CVE-2025-70998
📋 TL;DR
This vulnerability allows remote attackers to gain root access to UTT HiPER 810 / nv810v4 routers via telnet using insecure default credentials. Attackers can execute arbitrary commands with full system privileges. Organizations using these routers with default configurations are affected.
💻 Affected Systems
- UTT HiPER 810
- UTT nv810v4
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router allowing traffic interception, network pivoting, firmware modification, and persistent backdoor installation.
Likely Case
Unauthorized root access leading to network reconnaissance, credential harvesting, and potential lateral movement to connected systems.
If Mitigated
Limited impact if telnet is disabled and strong authentication is enforced, though default credentials remain a risk.
🎯 Exploit Status
Exploit requires only telnet access and knowledge of default credentials. GitHub repository contains working exploit code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Check vendor website for firmware updates and security advisories.
🔧 Temporary Workarounds
Disable Telnet Service
allCompletely disable telnet service and use SSH with key-based authentication instead.
telnet disable
service telnet stop
systemctl disable telnet
Change Default Credentials
allImmediately change all default passwords and implement strong password policies.
passwd root
configure user authentication
🧯 If You Can't Patch
- Network segmentation: Isolate affected routers in separate VLANs with strict firewall rules.
- Access control: Restrict telnet access to specific management IP addresses only.
🔍 How to Verify
Check if Vulnerable:
Attempt telnet connection to router port 23 and test default credentials. Check firmware version via web interface or CLI.Check Version:
show version or check web interface System Information pageVerify Fix Applied:
Verify telnet service is disabled (port 23 closed) and new credentials are required for all administrative access.📡 Detection & Monitoring
Log Indicators:
- Failed telnet authentication attempts
- Successful telnet logins from unusual IPs
- Multiple root login attempts
Network Indicators:
- Telnet traffic to router management interfaces
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (event="telnet_login" OR port=23) AND (user="root" OR user="admin")