CVE-2025-20260 — AI Deep Analysis Summary

Q: Root Cause? (CWE/Flaw)

🔍 **Root Cause**: **CWE-122** (Heap-based Buffer Overflow). 🐛 **Flaw**: Improper memory buffer allocation when handling PDF files. The software doesn't check bounds correctly! ⚠️

Q: Who is affected? (Versions/Components)

🏢 **Affected**: **ClamAV** (Clam AntiVirus). 📦 **Vendor**: Cisco (listed). 📅 **Published**: June 18, 2025. Check your versions immediately! 🕵️♂️

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

👑 **Privileges**: **High** (CVSS H/I/A: High). 📂 **Data**: Full access to Confidentiality, Integrity, and Availability. Hackers can execute arbitrary code with the privileges of the process! 💀

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

🚪 **Threshold**: **Low**. 🔑 **Auth**: None required (PR:N). 🖱️ **UI**: None required (UI:N). 🌐 **Network**: Remote (AV:N). Easy to exploit! 🎯

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

💣 **Public Exp?**: **YES**. 🔗 **PoC**: Available on GitHub (keyuraghao/CVE-2025-20260). 📜 **Details**: Includes Python script to generate malicious PDF + core dump analysis. Wild exploitation risk is HIGH! 🚨

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

🔎 **Self-Check**: Scan for **ClamAV** versions. 📄 **Focus**: Monitor PDF file processing logs. 🛡️ **Tool**: Use the provided PoC script to test your environment safely (in isolated labs)! 🧪

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

🩹 **Fixed?**: **YES**. 📢 **Patch**: ClamAV released security patches for versions **1.4.3** and **1.0.9**. 🔗 **Ref**: Official ClamAV blog post from June 2025. Update NOW! 🏃♂️

Q: What if no patch? (Workaround)

🚧 **No Patch?**: Isolate the service. 🚫 **Block**: Prevent untrusted PDF uploads. 🔄 **Mitigate**: Use alternative AV engines temporarily. Do not expose ClamAV to the internet without fixes! 🛑

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. ⚡ **Priority**: **P0**. 📉 **Risk**: CVSS High + Public Exploit + No Auth. Patch immediately to prevent RCE! 🚑

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**: ClamAV has a critical buffer overflow flaw in PDF processing. <br>💥 **Consequences**: Attackers can trigger memory corruption, leading to **Remote Code Execution (RCE)**.…

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Q2Root Cause? (CWE/Flaw)

🔍 **Root Cause**: **CWE-122** (Heap-based Buffer Overflow). <br>🐛 **Flaw**: Improper memory buffer allocation when handling PDF files. The software doesn't check bounds correctly! ⚠️

Q3Who is affected? (Versions/Components)

🏢 **Affected**: **ClamAV** (Clam AntiVirus). <br>📦 **Vendor**: Cisco (listed). <br>📅 **Published**: June 18, 2025. Check your versions immediately! 🕵️‍♂️

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: **High** (CVSS H/I/A: High). <br>📂 **Data**: Full access to Confidentiality, Integrity, and Availability. Hackers can execute arbitrary code with the privileges of the process! 💀

Q5Is exploitation threshold high? (Auth/Config)

🚪 **Threshold**: **Low**. <br>🔑 **Auth**: None required (PR:N). <br>🖱️ **UI**: None required (UI:N). <br>🌐 **Network**: Remote (AV:N). Easy to exploit! 🎯

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

💣 **Public Exp?**: **YES**. <br>🔗 **PoC**: Available on GitHub (keyuraghao/CVE-2025-20260). <br>📜 **Details**: Includes Python script to generate malicious PDF + core dump analysis. Wild exploitation risk is HIGH! 🚨

Q7How to self-check? (Features/Scanning)

🔎 **Self-Check**: Scan for **ClamAV** versions. <br>📄 **Focus**: Monitor PDF file processing logs. <br>🛡️ **Tool**: Use the provided PoC script to test your environment safely (in isolated labs)! 🧪

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Fixed?**: **YES**. <br>📢 **Patch**: ClamAV released security patches for versions **1.4.3** and **1.0.9**. <br>🔗 **Ref**: Official ClamAV blog post from June 2025. Update NOW! 🏃‍♂️

Q9What if no patch? (Workaround)

🚧 **No Patch?**: Isolate the service. <br>🚫 **Block**: Prevent untrusted PDF uploads. <br>🔄 **Mitigate**: Use alternative AV engines temporarily. Do not expose ClamAV to the internet without fixes! 🛑

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. <br>⚡ **Priority**: **P0**. <br>📉 **Risk**: CVSS High + Public Exploit + No Auth. Patch immediately to prevent RCE! 🚑

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Vulnerability detail Full AI analysis (login) Cisco CWE-122