Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: Apache Druid **Access Control Error** allowing arbitrary code execution.…

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **Root Cause**: **Access Control Error** (Bypass).
🔍 **Flaw**: Lack of proper authorization checks allows overriding system configurations via requests.…

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Affected**: **Apache Druid**.
📅 **Versions**: **0.20.0 and earlier**.
🏢 **Vendor**: Apache Software Foundation.

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

👑 **Privileges**: **Server Process Privileges** (Root/Admin level).
📂 **Data**: Full control over the server, arbitrary code execution, potential data exfiltration or system compromise.

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

⚠️ **Threshold**: **Medium**.
🔑 **Auth**: Requires **Authentication** (though default configs may lack it, the vuln specifically mentions 'authenticated users').…

Question 6

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

Accepted Answer

🔓 **Public Exp**: **YES**.
📜 **PoCs**: Multiple Python scripts, C# GUI tools, and HTTP POST payloads available on GitHub (e.g., `cve-2021-25646.py`).
🌐 **Wild Exp**: Active exploitation tools exist.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**:
1. Use Python PoC scripts (e.g., `python3 cve-2021-25646.py -h `).
2. Check for **DNSLog** callbacks.
3. Scan for default ports (e.g., **8888**) and Druid console titles.

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

✅ **Fixed**: **YES**.
🛠️ **Patch**: Released in **Druid 0.21.0**.
📢 **Source**: Apache mailing lists confirm fix in branch 0.21.0.

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **No Patch Workaround**:
1. **Restrict Access**: Block port 8888 via firewall/WAF.
2. **Enable Auth**: Ensure strict authentication is enabled (if possible in older versions).
3.…

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🔥 **Urgency**: **HIGH**.
📉 **Priority**: **Critical**.
💡 **Reason**: RCE with high privileges, public PoCs available, and many legacy systems still on 0.20.0 or earlier.…

Goal Reached Thanks to every supporter — we hit 100%!

CVE-2021-25646 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

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

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

Continue exploring