CVE-2021-27320 — AI Deep Analysis Summary

🚨 **Essence**: Blind SQL Injection in `contactus.php`. 📉 **Consequences**: Attackers can extract data via `firstname` parameter. The system is vulnerable to remote blind SQL injection attacks.

🛡️ **Root Cause**: Lack of input validation/sanitization. 🐛 **Flaw**: The `firstname` parameter in the contact form is not properly handled, allowing malicious SQL queries to be injected.

🎯 **Affected**: Sourcecodesterk Doctor Appointment System. 📦 **Version**: Specifically **Version 1.0**. ⚠️ **Component**: The `contactus.php` file.

💻 **Capabilities**: Unauthenticated attackers can insert malicious SQL. 📂 **Data Risk**: Potential access to database contents via blind injection techniques.…

🔓 **Threshold**: **LOW**. 🚫 **Auth**: No authentication needed. 🌐 **Access**: Remote exploitation possible via the web interface. Easy to trigger.

📜 **Public Exp**: Yes. 🧪 **PoC**: Available via Nuclei templates (ProjectDiscovery). 🌍 **Wild Exp**: Referenced in PacketStorm Security. Proof-of-concept exists.

🔍 **Check**: Scan for `contactus.php` endpoints. 📡 **Tool**: Use Nuclei with the specific CVE-2021-27320 template. 📝 **Test**: Inject payloads into the `firstname` field in the contact form.

🛠️ **Fix**: Update to a patched version if available. 📥 **Source**: Check Sourcecodesterk for official updates. 🔄 **Mitigation**: If no patch, apply manual code fixes to sanitize inputs.

🚧 **Workaround**: Disable or restrict the `contactus.php` form. 🛑 **Input Filtering**: Implement strict server-side validation for the `firstname` parameter.…

⚡ **Urgency**: **HIGH**. 🚨 **Priority**: Critical due to unauthenticated access. 📅 **Published**: March 2021. Immediate action required to prevent data leakage.