CVE-2021-27316 — AI Deep Analysis Summary

Q: What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Blind SQL Injection in `contactus.php`. 💥 **Consequences**: Attackers can extract database info via `lastname` & `email` params. Silent data theft!

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Improper input validation in **Name** and **Email** fields. 🐛 **Flaw**: Remote Blind SQL Injection (SQLi). No sanitization of user input.

Q: Who is affected? (Versions/Components)

🎯 **Affected**: Sourcecodesterk **Doctor Appointment System v1.0**. 📦 **Component**: `contactus.php` endpoint. 📅 **Published**: March 2021.

Q: What can hackers do? (Privileges/Data)

💀 **Hackers Can**: Inject malicious SQL queries. 📊 **Impact**: Access sensitive DB data (user info, appointments). 🕵️ **Privileges**: Unauthenticated access possible!

Q: Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. 🔓 **Auth**: None required (Unauthenticated). ⚙️ **Config**: Default installation likely vulnerable. Easy to trigger.

Q: Is there a public Exp? (PoC/Wild Exploitation)

🔓 **Public Exp?**: YES. 📜 **PoC**: Available via Nuclei templates & PacketStorm. 🌐 **Wild Exploitation**: High risk due to simple vector (`lastname` param).

Q: How to self-check? (Features/Scanning)

🔍 **Self-Check**: Scan for `contactus.php` in v1.0. 🧪 **Test**: Inject SQL payloads into `lastname` field. 📡 **Tool**: Use Nuclei or manual blind SQLi testing.

Q: Is it fixed officially? (Patch/Mitigation)

🛠️ **Official Fix**: Data implies **NO** official patch mentioned. ⚠️ **Status**: Unpatched open-source project. Vendor: n/a. Update source code manually.

Q: What if no patch? (Workaround)

🚧 **Workaround**: Sanitize `lastname` & `email` inputs server-side. 🚫 **Block**: Restrict access to `contactus.php` via WAF. 🛑 **Disable**: If not needed, remove the endpoint.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: HIGH. 🚨 **Priority**: Critical for v1.0 users. ⏳ **Time**: Exploits are public. Patch immediately or mitigate via WAF!

Updated May 08, 2026

This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis →

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Blind SQL Injection in `contactus.php`. 💥 **Consequences**: Attackers can extract database info via `lastname` & `email` params. Silent data theft!

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Improper input validation in **Name** and **Email** fields. 🐛 **Flaw**: Remote Blind SQL Injection (SQLi). No sanitization of user input.

Q3Who is affected? (Versions/Components)

🎯 **Affected**: Sourcecodesterk **Doctor Appointment System v1.0**. 📦 **Component**: `contactus.php` endpoint. 📅 **Published**: March 2021.

Q4What can hackers do? (Privileges/Data)

💀 **Hackers Can**: Inject malicious SQL queries. 📊 **Impact**: Access sensitive DB data (user info, appointments). 🕵️ **Privileges**: Unauthenticated access possible!

Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. 🔓 **Auth**: None required (Unauthenticated). ⚙️ **Config**: Default installation likely vulnerable. Easy to trigger.

Q6Is there a public Exp? (PoC/Wild Exploitation)

🔓 **Public Exp?**: YES. 📜 **PoC**: Available via Nuclei templates & PacketStorm. 🌐 **Wild Exploitation**: High risk due to simple vector (`lastname` param).

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: Scan for `contactus.php` in v1.0. 🧪 **Test**: Inject SQL payloads into `lastname` field. 📡 **Tool**: Use Nuclei or manual blind SQLi testing.

Q8Is it fixed officially? (Patch/Mitigation)

🛠️ **Official Fix**: Data implies **NO** official patch mentioned. ⚠️ **Status**: Unpatched open-source project. Vendor: n/a. Update source code manually.

Q9What if no patch? (Workaround)

🚧 **Workaround**: Sanitize `lastname` & `email` inputs server-side. 🚫 **Block**: Restrict access to `contactus.php` via WAF. 🛑 **Disable**: If not needed, remove the endpoint.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: HIGH. 🚨 **Priority**: Critical for v1.0 users. ⏳ **Time**: Exploits are public. Patch immediately or mitigate via WAF!

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