CVE-2025-49752 — AI Deep Analysis Summary

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

🚨 **Essence**: Critical Auth Bypass via Capture-Replay in Azure Bastion. 💥 **Consequences**: Attackers can hijack sessions without valid credentials, leading to full system compromise.

Q: Root Cause? (CWE/Flaw)

🔍 **Root Cause**: CWE-294 (Authentication Bypass by Capture-Replay). ⚠️ **Flaw**: The system fails to validate session tokens properly, allowing replayed authentication data to bypass checks.

Q: Who is affected? (Versions/Components)

🏢 **Affected**: Microsoft Azure Bastion Developer. 📦 **Component**: The managed PaaS service itself. Specific version numbers not listed, but the service is vulnerable.

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

🔓 **Privileges**: High. 📊 **Data**: Full access to underlying resources. CVSS indicates High Confidentiality & Integrity impact, Low Availability impact.

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

📉 **Threshold**: LOW. 🔑 **Auth**: None required (PR:N). 🌐 **Network**: Remote (AV:N). 👤 **User**: No interaction needed (UI:N). Easy to exploit!

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

🔥 **Public Exp**: YES. 📂 **PoC**: Available on GitHub (`boogabearbombernub/cve-2025-49752-lab`). Includes a Windows .exe/.bat for capture-replay simulation.

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

🔎 **Self-Check**: Monitor for unusual Bastion session tokens. 🛡️ **Scan**: Use tools to detect replayed authentication headers. Check if your Bastion instance is the 'Developer' variant.

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

🩹 **Official Fix**: YES. 📝 **Advisory**: Microsoft Security Response Center (MSRC) has published an update guide. Apply the vendor patch immediately.

Q: What if no patch? (Workaround)

🚧 **No Patch?**: Isolate Bastion endpoints. 🚫 **Block**: Restrict network access to Bastion. Implement strict WAF rules to block suspicious replay patterns if possible.

Q: Is it urgent? (Priority Suggestion)

⚡ **Urgency**: CRITICAL. 🔴 **Priority**: P1. CVSS is high, exploit is public, and no auth is needed. Patch NOW or face immediate risk of compromise.

Updated May 06, 2026 CVSS 10.0 · 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**: Critical Auth Bypass via Capture-Replay in Azure Bastion. <br>💥 **Consequences**: Attackers can hijack sessions without valid credentials, leading to full system compromise.

Q2Root Cause? (CWE/Flaw)

🔍 **Root Cause**: CWE-294 (Authentication Bypass by Capture-Replay). <br>⚠️ **Flaw**: The system fails to validate session tokens properly, allowing replayed authentication data to bypass checks.

Q3Who is affected? (Versions/Components)

🏢 **Affected**: Microsoft Azure Bastion Developer. <br>📦 **Component**: The managed PaaS service itself. Specific version numbers not listed, but the service is vulnerable.

Q4What can hackers do? (Privileges/Data)

🔓 **Privileges**: High. <br>📊 **Data**: Full access to underlying resources. CVSS indicates High Confidentiality & Integrity impact, Low Availability impact.

Q5Is exploitation threshold high? (Auth/Config)

📉 **Threshold**: LOW. <br>🔑 **Auth**: None required (PR:N). <br>🌐 **Network**: Remote (AV:N). <br>👤 **User**: No interaction needed (UI:N). Easy to exploit!

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

🔥 **Public Exp**: YES. <br>📂 **PoC**: Available on GitHub (`boogabearbombernub/cve-2025-49752-lab`). Includes a Windows .exe/.bat for capture-replay simulation.

Q7How to self-check? (Features/Scanning)

🔎 **Self-Check**: Monitor for unusual Bastion session tokens. <br>🛡️ **Scan**: Use tools to detect replayed authentication headers. Check if your Bastion instance is the 'Developer' variant.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Official Fix**: YES. <br>📝 **Advisory**: Microsoft Security Response Center (MSRC) has published an update guide. Apply the vendor patch immediately.

Q9What if no patch? (Workaround)

🚧 **No Patch?**: Isolate Bastion endpoints. <br>🚫 **Block**: Restrict network access to Bastion. Implement strict WAF rules to block suspicious replay patterns if possible.

Q10Is it urgent? (Priority Suggestion)

⚡ **Urgency**: CRITICAL. <br>🔴 **Priority**: P1. CVSS is high, exploit is public, and no auth is needed. Patch NOW or face immediate risk of compromise.

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Vulnerability detail Full AI analysis (login) Microsoft CWE-294