CVE-2023-5222 — AI Deep Analysis Summary

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-259** (Hardcoded Password). 🔍 **Flaw**: The `isValidUser` function uses a static, unchangeable password instead of dynamic verification.

Q: Who is affected? (Versions/Components)

🏭 **Vendor**: Viessmann. 📦 **Product**: Vitogate 300. 📉 **Affected**: Versions up to **2.1.3.0**.

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

👑 **Privileges**: Unauthenticated access to the Web Management Interface. 📂 **Data**: Potential read/write access to system configurations and device control data.

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

⚡ **Threshold**: **LOW**. 🔓 **Auth**: None required (PR:N). 🌐 **Vector**: Adjacent Network (AV:A). 🎯 **Complexity**: Low (AC:L). Easy to exploit.

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

💣 **Exploit**: **YES**. 📜 **PoC**: Available via Nuclei templates and GitHub repos. 🔥 **Status**: Publicly known and scriptable.

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

🔍 **Check**: Scan for `/cgi-bin/vitogate.cgi`. 🧪 **Test**: Use Nuclei template `CVE-2023-5222.yaml`. 📊 **Indicator**: Look for successful login with default hardcoded creds.

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

🔧 **Fix**: Update to version **> 2.1.3.0**. 📢 **Status**: Patch released by vendor. Check official Viessmann updates.

Q: What if no patch? (Workaround)

🚧 **Workaround**: 1. Isolate device from network. 2. Restrict access to trusted IPs only. 3. Monitor for unauthorized config changes.

Q: Is it urgent? (Priority Suggestion)

🔴 **Priority**: **HIGH**. ⏱️ **Urgency**: CVSS Score indicates significant impact (C:L/I:L/A:L). 🚀 **Action**: Patch immediately or isolate. Do not ignore.

Updated May 08, 2026 CVSS 6.3 · Medium

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**: Viessmann Vitogate has a hardcoded password flaw in `/cgi-bin/vitogate.cgi` (`isValidUser`).
💥 **Consequences**: Attackers bypass authentication.…

Read full answer (login)

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-259** (Hardcoded Password).
🔍 **Flaw**: The `isValidUser` function uses a static, unchangeable password instead of dynamic verification.

Q3Who is affected? (Versions/Components)

🏭 **Vendor**: Viessmann.
📦 **Product**: Vitogate 300.
📉 **Affected**: Versions up to **2.1.3.0**.

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: Unauthenticated access to the Web Management Interface.
📂 **Data**: Potential read/write access to system configurations and device control data.

Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: **LOW**.
🔓 **Auth**: None required (PR:N).
🌐 **Vector**: Adjacent Network (AV:A).
🎯 **Complexity**: Low (AC:L). Easy to exploit.

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

💣 **Exploit**: **YES**.
📜 **PoC**: Available via Nuclei templates and GitHub repos.
🔥 **Status**: Publicly known and scriptable.

Q7How to self-check? (Features/Scanning)

🔍 **Check**: Scan for `/cgi-bin/vitogate.cgi`.
🧪 **Test**: Use Nuclei template `CVE-2023-5222.yaml`.
📊 **Indicator**: Look for successful login with default hardcoded creds.

Q8Is it fixed officially? (Patch/Mitigation)

🔧 **Fix**: Update to version **> 2.1.3.0**.
📢 **Status**: Patch released by vendor. Check official Viessmann updates.

Q9What if no patch? (Workaround)

🚧 **Workaround**: 
Isolate device from network.
Restrict access to trusted IPs only.
Monitor for unauthorized config changes.

Q10Is it urgent? (Priority Suggestion)

🔴 **Priority**: **HIGH**.
⏱️ **Urgency**: CVSS Score indicates significant impact (C:L/I:L/A:L).
🚀 **Action**: Patch immediately or isolate. Do not ignore.

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Vulnerability detail Full AI analysis (login) Viessmann CWE-259