CVE-2021-41293 — AI Deep Analysis Summary

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

🚨 **Essence**: Path Traversal (CWE-22) in Ecoa BAS Controller. 💥 **Consequences**: Remote attackers can read **arbitrary files** from the device. Sensitive system info is leaked. No auth required.

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Improper input validation on the `fname` POST parameter in `viewlog.jsp`. 🔍 **CWE**: CWE-22 (Path Traversal). Allows accessing files outside the intended directory.

Q: Who is affected? (Versions/Components)

🏢 **Affected Vendor**: ECOA Technologies Corp. 📦 **Product**: Ecoa BAS Controller / ECS Router Controller ECS (FLASH). 📅 **Published**: 2021-09-30.

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

🕵️ **Attacker Action**: Disclose **arbitrary files**. 📂 **Data Risk**: High Confidentiality impact (CVSS C:H). Leaks sensitive & system info. 🔓 **Privileges**: Unauthenticated access. Remote exploitation.

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

⚡ **Threshold**: LOW. 🔑 **Auth**: None required (PR:N). 🌐 **Network**: Remote (AV:N). 🎯 **Complexity**: Low (AC:L). Easy to exploit.

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

💻 **Public Exp**: YES. 📜 **PoC**: Available via Nuclei templates (ProjectDiscovery). 🔗 **Link**: `http/cves/2021/CVE-2021-41293.yaml`. Wild exploitation possible.

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

🔍 **Self-Check**: Scan for `viewlog.jsp` endpoint. 📝 **Test**: POST request with `fname` parameter containing traversal sequences (e.g., `../../etc/passwd`). 🛠️ **Tool**: Use Nuclei or similar scanners.

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

🩹 **Patch**: Refer to vendor ECOA for updates. 📋 **Reference**: TW-CERT advisory available. ⚠️ **Note**: Data does not specify exact patch version, but mitigation is critical.

Q: What if no patch? (Workaround)

🚧 **No Patch?**: Block external access to `viewlog.jsp`. 🛡️ **WAF**: Implement rules to block path traversal patterns (`../`) in POST parameters. 🔒 **Network**: Restrict access to internal networks only.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: HIGH. 📊 **CVSS**: 7.5 (High). ⚠️ **Reason**: Unauthenticated, remote, easy exploit. Immediate action needed to prevent data leakage.

Updated May 08, 2026 CVSS 7.5 · 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**: Path Traversal (CWE-22) in Ecoa BAS Controller. <br>💥 **Consequences**: Remote attackers can read **arbitrary files** from the device. Sensitive system info is leaked. No auth required.

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Improper input validation on the `fname` POST parameter in `viewlog.jsp`. <br>🔍 **CWE**: CWE-22 (Path Traversal). Allows accessing files outside the intended directory.

Q3Who is affected? (Versions/Components)

🏢 **Affected Vendor**: ECOA Technologies Corp. <br>📦 **Product**: Ecoa BAS Controller / ECS Router Controller ECS (FLASH). <br>📅 **Published**: 2021-09-30.

Q4What can hackers do? (Privileges/Data)

🕵️ **Attacker Action**: Disclose **arbitrary files**. <br>📂 **Data Risk**: High Confidentiality impact (CVSS C:H). Leaks sensitive & system info. <br>🔓 **Privileges**: Unauthenticated access. Remote exploitation.

Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. <br>🔑 **Auth**: None required (PR:N). <br>🌐 **Network**: Remote (AV:N). <br>🎯 **Complexity**: Low (AC:L). Easy to exploit.

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

💻 **Public Exp**: YES. <br>📜 **PoC**: Available via Nuclei templates (ProjectDiscovery). <br>🔗 **Link**: `http/cves/2021/CVE-2021-41293.yaml`. Wild exploitation possible.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: Scan for `viewlog.jsp` endpoint. <br>📝 **Test**: POST request with `fname` parameter containing traversal sequences (e.g., `../../etc/passwd`). <br>🛠️ **Tool**: Use Nuclei or similar scanners.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Patch**: Refer to vendor ECOA for updates. <br>📋 **Reference**: TW-CERT advisory available. <br>⚠️ **Note**: Data does not specify exact patch version, but mitigation is critical.

Q9What if no patch? (Workaround)

🚧 **No Patch?**: Block external access to `viewlog.jsp`. <br>🛡️ **WAF**: Implement rules to block path traversal patterns (`../`) in POST parameters. <br>🔒 **Network**: Restrict access to internal networks only.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: HIGH. <br>📊 **CVSS**: 7.5 (High). <br>⚠️ **Reason**: Unauthenticated, remote, easy exploit. Immediate action needed to prevent data leakage.

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Vulnerability detail Full AI analysis (login) ECOA CWE-22