CVE-2025-8182
📋 TL;DR
This vulnerability in Tenda AC18 routers allows attackers to exploit weak password requirements in the Samba configuration file. Attackers can potentially gain unauthorized access to SMB shares if they can guess or brute-force weak passwords. Only Tenda AC18 router users running the affected firmware version are impacted.
💻 Affected Systems
- Tenda AC18
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Unauthorized access to SMB shares containing sensitive files, potentially leading to data theft or lateral movement within the network.
Likely Case
Limited impact due to high attack complexity and difficulty of exploitation; attackers would need to guess weak passwords that users might have set.
If Mitigated
Minimal impact if strong passwords are already enforced or SMB services are disabled.
🎯 Exploit Status
Exploit requires guessing or brute-forcing weak passwords; disclosed publicly but difficult to execute successfully.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Upload via router admin interface. 4. Reboot router after update.
🔧 Temporary Workarounds
Disable SMB services
allTurn off SMB file sharing to eliminate the attack surface completely
Login to router admin interface
Navigate to USB Settings or File Sharing
Disable Samba/SMB sharing
Enforce strong SMB passwords
allRequire complex passwords for all SMB user accounts
Change SMB user passwords to 12+ characters with mix of upper/lower/digits/symbols
🧯 If You Can't Patch
- Disable SMB file sharing entirely through router settings
- Implement network segmentation to isolate router from sensitive systems
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version is 15.03.05.19, system is vulnerable.Check Version:
Login to router admin panel at 192.168.0.1 or 192.168.1.1 and check System Status or Firmware VersionVerify Fix Applied:
After firmware update, verify version is newer than 15.03.05.19; check that SMB passwords meet complexity requirements.📡 Detection & Monitoring
Log Indicators:
- Multiple failed SMB authentication attempts
- Unusual SMB connection patterns from external IPs
Network Indicators:
- SMB traffic (ports 139/445) to router from unexpected sources
- Brute-force patterns in SMB authentication
SIEM Query:
source="router_logs" AND (event="SMB_auth_failed" OR port=139 OR port=445) | stats count by src_ip