🚨 CVE-2026-11499

Stack-Based Buffer Overflow in Tenda HG7 / HG9 / HG10 Routers

📖 Overview

CVE-2026-11499 is a reported stack-based buffer overflow vulnerability affecting several Tenda router models, including:

• HG7
• HG9
• HG10

Successful exploitation may allow an attacker to trigger a crash, denial of service, or potentially achieve Remote Code Execution (RCE) depending on the vulnerable code path and deployment configuration.

⚠️ Technical details are currently limited and public disclosure appears to be ongoing.

🎯 Affected Products

🛠 Vulnerability Details

⚡ Potential Impact

An attacker may be able to:

• Cause device crashes
• Trigger denial of service conditions
• Corrupt process memory
• Execute arbitrary code
• Gain unauthorized access to the device

User Input
     │
     ▼
┌───────────────┐
│ Vulnerable    │
│ Function      │
└──────┬────────┘
       │
       ▼
 Buffer Overflow
       │
       ▼
 Memory Corruption
       │
       ▼
 Potential RCE

🔬 Technical Analysis

Vulnerability Class

The issue has been categorized as a:

char buffer[256];
strcpy(buffer, attacker_input);

When input exceeds the allocated buffer size, adjacent memory may be overwritten.

Possible consequences include:

• Application crashes
• Stack corruption
• Control-flow hijacking
• Arbitrary code execution

🧪 Proof of Concept

🚫 No public PoC has been released at the time of writing.

When a PoC becomes available, testing should be performed only in authorized laboratory environments.

🛡 Mitigation

Immediate Actions

• Update firmware once patches become available
• Restrict administrative access
• Disable remote management if unnecessary
• Monitor router logs
• Isolate vulnerable devices from untrusted networks

📅 Timeline

📚 References

• MITRE CVE Program
• NVD (National Vulnerability Database)
• Tenda Security Advisories

⚠️ Disclaimer

This repository is intended for:

• Security research
• Vulnerability analysis
• Educational purposes

Do not use this information against systems without explicit authorization.