CVE-2025-6704 — AI Deep Analysis Summary

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

🚨 **Essence**: Arbitrary file write in Secure PDF eXchange. 💥 **Consequences**: Pre-auth Remote Code Execution (RCE). Critical impact on Confidentiality, Integrity, and Availability.

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-78 (OS Command Injection). 🔍 **Flaw**: The Secure PDF eXchange feature allows attackers to write arbitrary files to the system.

Q: Who is affected? (Versions/Components)

🏢 **Vendor**: Sophos. 📦 **Product**: Sophos Firewall. 📅 **Affected**: Versions **before** 21.0 MR2.

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

👑 **Privileges**: Full system control via RCE. 📂 **Data**: Complete compromise of firewall configurations and protected network data.

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

🔓 **Threshold**: LOW. 🌐 **Auth**: Pre-authentication required. 📡 **Network**: Network accessible (AV:N). No user interaction needed.

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

📜 **Public Exp?**: No PoCs listed in data. ⚠️ **Risk**: High CVSS score suggests easy exploitation potential despite lack of public code.

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

🔍 **Check**: Scan for Sophos Firewall versions < 21.0 MR2. 👀 **Feature**: Look for active use of 'Secure PDF eXchange' functionality.

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

✅ **Fix**: Upgrade to **Sophos Firewall 21.0 MR2** or later. 📝 **Ref**: See Sophos Security Advisory SA-20250721-SFOS-RCE.

Q: What if no patch? (Workaround)

🛑 **Workaround**: Disable 'Secure PDF eXchange' feature immediately if patching is delayed. 🚧 **Mitigate**: Restrict network access to the management interface.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: CRITICAL. 🚀 **Priority**: Patch IMMEDIATELY. Pre-auth RCE is a top-tier threat for infrastructure.

Updated May 06, 2026 CVSS 9.8 · 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**: Arbitrary file write in Secure PDF eXchange. <br>💥 **Consequences**: Pre-auth Remote Code Execution (RCE). Critical impact on Confidentiality, Integrity, and Availability.

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-78 (OS Command Injection). <br>🔍 **Flaw**: The Secure PDF eXchange feature allows attackers to write arbitrary files to the system.

Q3Who is affected? (Versions/Components)

🏢 **Vendor**: Sophos. <br>📦 **Product**: Sophos Firewall. <br>📅 **Affected**: Versions **before** 21.0 MR2.

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: Full system control via RCE. <br>📂 **Data**: Complete compromise of firewall configurations and protected network data.

Q5Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: LOW. <br>🌐 **Auth**: Pre-authentication required. <br>📡 **Network**: Network accessible (AV:N). No user interaction needed.

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

📜 **Public Exp?**: No PoCs listed in data. <br>⚠️ **Risk**: High CVSS score suggests easy exploitation potential despite lack of public code.

Q7How to self-check? (Features/Scanning)

🔍 **Check**: Scan for Sophos Firewall versions < 21.0 MR2. <br>👀 **Feature**: Look for active use of 'Secure PDF eXchange' functionality.

Q8Is it fixed officially? (Patch/Mitigation)

✅ **Fix**: Upgrade to **Sophos Firewall 21.0 MR2** or later. <br>📝 **Ref**: See Sophos Security Advisory SA-20250721-SFOS-RCE.

Q9What if no patch? (Workaround)

🛑 **Workaround**: Disable 'Secure PDF eXchange' feature immediately if patching is delayed. <br>🚧 **Mitigate**: Restrict network access to the management interface.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: CRITICAL. <br>🚀 **Priority**: Patch IMMEDIATELY. Pre-auth RCE is a top-tier threat for infrastructure.

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Vulnerability detail Full AI analysis (login) Sophos CWE-78