CVE-2025-20352 — AI Deep Analysis Summary

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

🚨 **Essence**: Cisco IOS/IOS XE has a **Stack Overflow** in the SNMP subsystem. 💥 **Consequences**: Can lead to **Denial of Service (DoS)** or **Arbitrary Code Execution**. Critical stability risk!

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-121** (Stack-based Buffer Overflow). 🔍 **Flaw**: Improper handling of data in the SNMP subsystem leads to memory corruption.

Q: Who is affected? (Versions/Components)

🏢 **Affected**: **Cisco IOS** and **Cisco IOS XE Software**. 📦 **Vendor**: Cisco Systems. ⚠️ **Scope**: Network operating systems widely used in enterprise infrastructure.

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

💀 **Attacker Actions**: 1️⃣ **DoS**: Crash the device/network service. 2️⃣ **RCE**: Execute arbitrary code on the device. 🔓 **Impact**: Full compromise of network control plane.

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

🔑 **Threshold**: **Medium**. 📝 **Auth Required**: **Local Privileges (PR:L)** needed. 🌐 **Network**: Network-accessible (AV:N). ⚙️ **Complexity**: Low (AC:L).

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

🔓 **Exploit Status**: **Yes**. 📂 **PoC Available**: GitHub repo `scadastrangelove/CVE-2025-20352`. 🧪 **Tool**: Uses `onesixtyone` + parser for SNMP exposure check.

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

🔍 **Self-Check**: 1. Scan for SNMP services on Cisco devices. 2. Use the provided PoC script to test for stack overflow triggers. 3. Check device version against Cisco advisories.

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

🩹 **Fix Status**: **Yes**. 📄 **Advisory**: Cisco Security Advisory `cisco-sa-snmp-x4LPhte`. ✅ **Action**: Apply official patches from Cisco ASAP.

Q: What if no patch? (Workaround)

🚧 **No Patch?**: 1️⃣ **Block SNMP**: Restrict SNMP access via ACLs. 2️⃣ **Disable**: Turn off SNMP if not needed. 3️⃣ **Monitor**: Watch for DoS spikes or unauthorized config changes.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. 📅 **Published**: 2025-09-24. ⚡ **Priority**: Immediate patching required due to RCE potential and available PoC. Don't wait!

Updated May 06, 2026 CVSS 7.7 · 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**: Cisco IOS/IOS XE has a **Stack Overflow** in the SNMP subsystem. <br>💥 **Consequences**: Can lead to **Denial of Service (DoS)** or **Arbitrary Code Execution**. Critical stability risk!

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-121** (Stack-based Buffer Overflow). <br>🔍 **Flaw**: Improper handling of data in the SNMP subsystem leads to memory corruption.

Q3Who is affected? (Versions/Components)

🏢 **Affected**: **Cisco IOS** and **Cisco IOS XE Software**. <br>📦 **Vendor**: Cisco Systems. <br>⚠️ **Scope**: Network operating systems widely used in enterprise infrastructure.

Q4What can hackers do? (Privileges/Data)

💀 **Attacker Actions**: <br>1️⃣ **DoS**: Crash the device/network service. <br>2️⃣ **RCE**: Execute arbitrary code on the device. <br>🔓 **Impact**: Full compromise of network control plane.

Q5Is exploitation threshold high? (Auth/Config)

🔑 **Threshold**: **Medium**. <br>📝 **Auth Required**: **Local Privileges (PR:L)** needed. <br>🌐 **Network**: Network-accessible (AV:N). <br>⚙️ **Complexity**: Low (AC:L).

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

🔓 **Exploit Status**: **Yes**. <br>📂 **PoC Available**: GitHub repo `scadastrangelove/CVE-2025-20352`. <br>🧪 **Tool**: Uses `onesixtyone` + parser for SNMP exposure check.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: <br>1. Scan for SNMP services on Cisco devices. <br>2. Use the provided PoC script to test for stack overflow triggers. <br>3. Check device version against Cisco advisories.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Fix Status**: **Yes**. <br>📄 **Advisory**: Cisco Security Advisory `cisco-sa-snmp-x4LPhte`. <br>✅ **Action**: Apply official patches from Cisco ASAP.

Q9What if no patch? (Workaround)

🚧 **No Patch?**: <br>1️⃣ **Block SNMP**: Restrict SNMP access via ACLs. <br>2️⃣ **Disable**: Turn off SNMP if not needed. <br>3️⃣ **Monitor**: Watch for DoS spikes or unauthorized config changes.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. <br>📅 **Published**: 2025-09-24. <br>⚡ **Priority**: Immediate patching required due to RCE potential and available PoC. Don't wait!

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Vulnerability detail Full AI analysis (login) Cisco CWE-121