CVE-2025-2621 — AI Deep Analysis Summary

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

🚨 **Essence**: Stack Buffer Overflow in D-Link DAP-1620. 💥 **Consequences**: Remote Code Execution (RCE), full system compromise. Critical impact on Confidentiality, Integrity, and Availability.

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-121 (Stack-based Buffer Overflow). 🐛 **Flaw**: Improper handling of the `uid` parameter in the `check_dws_cookie` function leads to memory corruption.

Q: Who is affected? (Versions/Components)

📦 **Affected**: D-Link DAP-1620 Wireless Range Extender. 📅 **Version**: Specifically **1.03**. 🏢 **Vendor**: D-Link (China/Global).

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

🔓 **Privileges**: Attacker gains **High** privileges (likely root/admin). 📊 **Data**: Full access to device data, network traffic, and potential pivot to internal network. CVSS: H/H/H.

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

⚡ **Threshold**: **LOW**. 🌐 **Auth**: None required (PR:N). 📡 **Vector**: Network (AV:N). 🖱️ **UI**: None required (UI:N). Easy remote exploitation.

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

🔍 **Exploit Status**: Public indicators exist. 📝 **Refs**: VDB-300623 and Notion.io exploit details available. ⚠️ **Wild Exploit**: Likely active given low barrier to entry.

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

🔎 **Self-Check**: Scan for D-Link DAP-1620 devices running firmware **1.03**. 📡 **Feature**: Look for exposed `check_dws_cookie` endpoint or similar UID handling logic in network traffic.

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

🩹 **Fix**: Check D-Link official support for firmware update > 1.03. 📥 **Action**: Download latest patch immediately. 🛡️ **Mitigation**: If no patch, isolate device from internet.

Q: What if no patch? (Workaround)

🚧 **Workaround**: Block external access to the device. 🚫 **Network**: Disable UPnP, restrict WAN access. 📵 **Physical**: Unplug if not needed. 🔄 **Monitor**: Watch for anomalous network traffic.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. 🚨 **Priority**: Patch immediately. CVSS 9.8 (High). Remote, unauthenticated RCE is a top-tier threat. Do not delay.

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**: Stack Buffer Overflow in D-Link DAP-1620. 💥 **Consequences**: Remote Code Execution (RCE), full system compromise. Critical impact on Confidentiality, Integrity, and Availability.

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-121 (Stack-based Buffer Overflow). 🐛 **Flaw**: Improper handling of the `uid` parameter in the `check_dws_cookie` function leads to memory corruption.

Q3Who is affected? (Versions/Components)

📦 **Affected**: D-Link DAP-1620 Wireless Range Extender. 📅 **Version**: Specifically **1.03**. 🏢 **Vendor**: D-Link (China/Global).

Q4What can hackers do? (Privileges/Data)

🔓 **Privileges**: Attacker gains **High** privileges (likely root/admin). 📊 **Data**: Full access to device data, network traffic, and potential pivot to internal network. CVSS: H/H/H.

Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: **LOW**. 🌐 **Auth**: None required (PR:N). 📡 **Vector**: Network (AV:N). 🖱️ **UI**: None required (UI:N). Easy remote exploitation.

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

🔍 **Exploit Status**: Public indicators exist. 📝 **Refs**: VDB-300623 and Notion.io exploit details available. ⚠️ **Wild Exploit**: Likely active given low barrier to entry.

Q7How to self-check? (Features/Scanning)

🔎 **Self-Check**: Scan for D-Link DAP-1620 devices running firmware **1.03**. 📡 **Feature**: Look for exposed `check_dws_cookie` endpoint or similar UID handling logic in network traffic.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Fix**: Check D-Link official support for firmware update > 1.03. 📥 **Action**: Download latest patch immediately. 🛡️ **Mitigation**: If no patch, isolate device from internet.

Q9What if no patch? (Workaround)

🚧 **Workaround**: Block external access to the device. 🚫 **Network**: Disable UPnP, restrict WAN access. 📵 **Physical**: Unplug if not needed. 🔄 **Monitor**: Watch for anomalous network traffic.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. 🚨 **Priority**: Patch immediately. CVSS 9.8 (High). Remote, unauthenticated RCE is a top-tier threat. Do not delay.

Continue exploring

Vulnerability detail Full AI analysis (login) D-Link CWE-121