CVE-2024-4008 — AI Deep Analysis Summary

Q: Root Cause? (CWE/Flaw)

🔍 **Root Cause**: **CWE-497** (Exposure of Sensitive System Information to Unauthorized Actors). 🐛 **Flaw**: The **FDSK** is improperly exposed/leaked, allowing unauthorized access to critical security keys.

Q: Who is affected? (Versions/Components)

🏢 **Affected Vendor**: ABB, Busch-Jaeger. 📦 **Specific Products**: - **2.4! Display 55** - **SD/U12.55.11-825** ⚠️ *Check your specific KNX device models.*

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

👮 **Privileges**: **High Impact** (CVSS I:H, A:H). 📂 **Data**: Local KNX bus access. 🎮 **Action**: Attackers can **take control** of the system. Full compromise of the automation network.

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

🔓 **Threshold**: **LOW**. 🌐 **Network**: **Local** access required (AV:A). 🔑 **Auth**: **None** required (PR:N). 👤 **User**: **No interaction** needed (UI:N). Easy to exploit if on the same network.

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

💣 **Public Exploit**: **No** public PoC/Exploit listed in data. ⚠️ **Risk**: Despite no public code, the low barrier to entry makes it highly vulnerable to custom scripts.

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

🔎 **Self-Check**: Scan for **ABB KNX** devices. 🔑 **Indicator**: Look for exposed **FDSK** values in network traffic or device responses. 📡 **Tool**: Use KNX bus sniffers to detect key leakage.

Q: What if no patch? (Workaround)

🚧 **No Patch Workaround**: 1. **Isolate** KNX bus from untrusted networks. 2. **Restrict** physical access to local bus segments. 3. **Monitor** for unauthorized FDSK requests.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. 📉 **CVSS**: High severity (I:H, A:H). ✅ **Priority**: Patch immediately or isolate network. Do not ignore local bus security.

Updated May 08, 2026 CVSS 9.6 · Critical

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**: ABB KNX systems leak sensitive data via **FDSK** (Firmware Download Security Key). <br>💥 **Consequences**: Attackers gain **full control** of the local KNX bus.…

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Q2Root Cause? (CWE/Flaw)

🔍 **Root Cause**: **CWE-497** (Exposure of Sensitive System Information to Unauthorized Actors). <br>🐛 **Flaw**: The **FDSK** is improperly exposed/leaked, allowing unauthorized access to critical security keys.

Q3Who is affected? (Versions/Components)

🏢 **Affected Vendor**: ABB, Busch-Jaeger. <br>📦 **Specific Products**: <br>- **2.4! Display 55** <br>- **SD/U12.55.11-825** <br>⚠️ *Check your specific KNX device models.*

Q4What can hackers do? (Privileges/Data)

👮 **Privileges**: **High Impact** (CVSS I:H, A:H). <br>📂 **Data**: Local KNX bus access. <br>🎮 **Action**: Attackers can **take control** of the system. Full compromise of the automation network.

Q5Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: **LOW**. <br>🌐 **Network**: **Local** access required (AV:A). <br>🔑 **Auth**: **None** required (PR:N). <br>👤 **User**: **No interaction** needed (UI:N). Easy to exploit if on the same network.

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

💣 **Public Exploit**: **No** public PoC/Exploit listed in data. <br>⚠️ **Risk**: Despite no public code, the low barrier to entry makes it highly vulnerable to custom scripts.

Q7How to self-check? (Features/Scanning)

🔎 **Self-Check**: Scan for **ABB KNX** devices. <br>🔑 **Indicator**: Look for exposed **FDSK** values in network traffic or device responses. <br>📡 **Tool**: Use KNX bus sniffers to detect key leakage.

Q8Is it fixed officially? (Patch/Mitigation)

🛡️ **Official Fix**: Reference link provided (ABB Security Advisory). <br>📄 **Action**: Check the [ABB Download Link](https://search.abb.com/library/Download.aspx?…

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Q9What if no patch? (Workaround)

🚧 **No Patch Workaround**: <br>1. **Isolate** KNX bus from untrusted networks. <br>2. **Restrict** physical access to local bus segments. <br>3. **Monitor** for unauthorized FDSK requests.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. <br>📉 **CVSS**: High severity (I:H, A:H). <br>✅ **Priority**: Patch immediately or isolate network. Do not ignore local bus security.

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Vulnerability detail Full AI analysis (login) ABB, Busch-Jaeger CWE-497