CVE-2020-3566 — AI Deep Analysis Summary

Q: Who is affected? (Versions/Components)

🏢 **Vendor**: Cisco. 📦 **Affected Products**: **Cisco IOS** and **Cisco IOS XR Software**. ⚠️ **Specific Component**: DVMRP (Distance Vector Multicast Routing Protocol) handling IGMP traffic.

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

📉 **Threshold**: **LOW**. 🌐 **Network**: Attack vector is **Network (AV:N)**. 🔑 **Auth**: **None required (PR:N)**. 🖱️ **User Interaction**: **None required (UI:N)**. Easy to exploit remotely without credentials.

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

🚫 **Public Exploit**: **No**. The `pocs` field is empty. 📜 **Advisory**: Official Cisco Security Advisory exists. 🕵️ **Status**: No known wild exploitation or public PoC code available yet.

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

🔍 **Check**: Scan for devices running **Cisco IOS XR**. 📡 **Feature**: Look for **DVMRP** and **IGMP** services enabled. 📊 **Indicator**: Monitor for abnormal memory usage spikes related to multicast traffic processing.

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

✅ **Fixed**: **Yes**. 📅 **Published**: 2020-08-29. 📝 **Reference**: Cisco Security Advisory (cisco-sa-iosxr-dvmrp-memexh-dSmpdvfz). 🔄 **Action**: Apply the official vendor patch/update immediately.

Updated May 06, 2026 CVSS 8.6 · High

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**: A resource management flaw in Cisco IOS XR's DVMRP module. 📉 **Consequences**: Attackers send crafted IGMP packets causing **Memory Exhaustion**.…

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Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-400** (Uncontrolled Resource Consumption). 🐛 **Flaw**: Inadequate queue management for **IGMP packets** within the DVMRP implementation.…

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Q3Who is affected? (Versions/Components)

🏢 **Vendor**: Cisco. 📦 **Affected Products**: **Cisco IOS** and **Cisco IOS XR Software**. ⚠️ **Specific Component**: DVMRP (Distance Vector Multicast Routing Protocol) handling IGMP traffic.

Q4What can hackers do? (Privileges/Data)

💻 **Action**: Send specially crafted **IGMP packets**. 🔓 **Privileges**: **None required** (Remote, No Auth). 🎯 **Impact**: **High Availability (A:H)** impact.…

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Q5Is exploitation threshold high? (Auth/Config)

📉 **Threshold**: **LOW**. 🌐 **Network**: Attack vector is **Network (AV:N)**. 🔑 **Auth**: **None required (PR:N)**. 🖱️ **User Interaction**: **None required (UI:N)**. Easy to exploit remotely without credentials.

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

🚫 **Public Exploit**: **No**. The `pocs` field is empty. 📜 **Advisory**: Official Cisco Security Advisory exists. 🕵️ **Status**: No known wild exploitation or public PoC code available yet.

Q7How to self-check? (Features/Scanning)

🔍 **Check**: Scan for devices running **Cisco IOS XR**. 📡 **Feature**: Look for **DVMRP** and **IGMP** services enabled. 📊 **Indicator**: Monitor for abnormal memory usage spikes related to multicast traffic processing.

Q8Is it fixed officially? (Patch/Mitigation)

✅ **Fixed**: **Yes**. 📅 **Published**: 2020-08-29. 📝 **Reference**: Cisco Security Advisory (cisco-sa-iosxr-dvmrp-memexh-dSmpdvfz). 🔄 **Action**: Apply the official vendor patch/update immediately.

Q9What if no patch? (Workaround)

🚧 **Workaround**: If patching is delayed, **restrict IGMP traffic** via ACLs. 🛑 **Mitigation**: Block unnecessary multicast traffic at the network perimeter.…

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Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. 📈 **CVSS**: **7.5** (High). 🚨 **Reason**: Remote, unauthenticated, easy to exploit, causes **High Availability** loss.…

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Vulnerability detail Full AI analysis (login) Cisco CWE-400