CVE-2016-5365
📋 TL;DR
A stack-based buffer overflow vulnerability in Huawei Honor WS851 routers allows remote attackers to execute arbitrary commands with root privileges. This affects routers running software version 1.1.21.1 and earlier. Attackers can gain complete control of affected devices without authentication.
💻 Affected Systems
- Huawei Honor WS851 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with root access, enabling traffic interception, network pivoting, malware deployment, and persistent backdoor installation.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and botnet recruitment.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity; specific exploit vectors not publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.1.21.1
Vendor Advisory: http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20160607-01-honorrouter-en
Restart Required: Yes
Instructions:
1. Access router admin interface. 2. Check for firmware updates. 3. Download and install latest firmware. 4. Reboot router after update.
🔧 Temporary Workarounds
Network isolation
allPlace router behind firewall with strict inbound rules to limit exposure.
Access restriction
allDisable remote administration and restrict management interface to trusted IPs.
🧯 If You Can't Patch
- Replace affected router with supported model
- Implement network segmentation to isolate router from critical assets
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version is 1.1.21.1 or earlier, device is vulnerable.Check Version:
Login to router admin interface and navigate to System Status or Firmware Information page.Verify Fix Applied:
Confirm firmware version is higher than 1.1.21.1 after update.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed access attempts followed by successful root access
Network Indicators:
- Unexpected outbound connections from router
- DNS configuration changes
- Unusual traffic patterns from router IP
SIEM Query:
source="router_logs" AND (event="command_execution" OR user="root")