CVE-2025-7574 — AI Deep Analysis Summary

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

🚨 **Essence**: Critical flaw in LB-LINK routers (BL-AC1900, etc.). 💥 **Consequences**: Attackers gain full control. CVSS Score is **HIGH** (9.8). Total compromise of Confidentiality, Integrity, and Availability.

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Improper Authentication (CWE-287). 🔍 **Flaw**: The `reboot/restore` function in `/cgi-bin/lighttpd.cgi` lacks proper access checks. No login required for sensitive operations.

Q: Who is affected? (Versions/Components)

📦 **Affected**: LB-LINK Products. 📋 **Models**: BL-AC1900, BL-AC2100, BL-AC3600, BL-WR9000, BL-AX5400P, BL-AX1800. ⚠️ **Scope**: Multiple versions listed in vendor advisories.

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

🕵️ **Hackers Can**: Execute arbitrary sensitive operations. 🔓 **Privileges**: Bypass authentication entirely. 📂 **Data**: Full read/write access implied by High CVSS. Can reboot or restore device remotely.

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

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

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

📂 **Exploit**: Yes, PoC available. 🔗 **Source**: GitHub repos linked in references. 🔥 **Status**: Publicly disclosed. Wild exploitation risk is **HIGH**.

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

🔍 **Self-Check**: Scan for `/cgi-bin/lighttpd.cgi`. 🧪 **Test**: Attempt `restore` or `reboot` commands without session cookies. 📡 **Tools**: Use Nmap scripts or custom HTTP requests to verify lack of auth check.

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

🛠️ **Fix**: Vendor advisory exists (VDB-316272). 📥 **Patch**: Check official LB-LINK support site for firmware updates. ⏳ **Status**: Published July 2025. Updates likely available for listed models.

Q: What if no patch? (Workaround)

🚧 **Workaround**: If no patch: 1. **Isolate**: Move router to untrusted VLAN. 2. **Block**: Firewall rules blocking external access to port 80/443. 3. **Disable**: Turn off remote management features if possible.

Q: Is it urgent? (Priority Suggestion)

🔴 **Urgency**: **CRITICAL**. 🚀 **Priority**: Patch immediately. ⚠️ **Reason**: No auth needed + High Impact + Public PoC. Immediate action required for home/SME networks.

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**: Critical flaw in LB-LINK routers (BL-AC1900, etc.).
💥 **Consequences**: Attackers gain full control. CVSS Score is **HIGH** (9.8). Total compromise of Confidentiality, Integrity, and Availability.

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Improper Authentication (CWE-287).
🔍 **Flaw**: The `reboot/restore` function in `/cgi-bin/lighttpd.cgi` lacks proper access checks. No login required for sensitive operations.

Q3Who is affected? (Versions/Components)

📦 **Affected**: LB-LINK Products.
📋 **Models**: BL-AC1900, BL-AC2100, BL-AC3600, BL-WR9000, BL-AX5400P, BL-AX1800.
⚠️ **Scope**: Multiple versions listed in vendor advisories.

Q4What can hackers do? (Privileges/Data)

🕵️ **Hackers Can**: Execute arbitrary sensitive operations.
🔓 **Privileges**: Bypass authentication entirely.
📂 **Data**: Full read/write access implied by High CVSS. Can reboot or restore device remotely.

Q5Is exploitation threshold high? (Auth/Config)

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

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

📂 **Exploit**: Yes, PoC available.
🔗 **Source**: GitHub repos linked in references.
🔥 **Status**: Publicly disclosed. Wild exploitation risk is **HIGH**.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: Scan for `/cgi-bin/lighttpd.cgi`.
🧪 **Test**: Attempt `restore` or `reboot` commands without session cookies.
📡 **Tools**: Use Nmap scripts or custom HTTP requests to verify lack of auth check.

Q8Is it fixed officially? (Patch/Mitigation)

🛠️ **Fix**: Vendor advisory exists (VDB-316272).
📥 **Patch**: Check official LB-LINK support site for firmware updates.
⏳ **Status**: Published July 2025. Updates likely available for listed models.

Q9What if no patch? (Workaround)

🚧 **Workaround**: If no patch:
**Isolate**: Move router to untrusted VLAN.
**Block**: Firewall rules blocking external access to port 80/443.
**Disable**: Turn off remote management features if possible.

Q10Is it urgent? (Priority Suggestion)

🔴 **Urgency**: **CRITICAL**.
🚀 **Priority**: Patch immediately.
⚠️ **Reason**: No auth needed + High Impact + Public PoC. Immediate action required for home/SME networks.

Continue exploring

Vulnerability detail Full AI analysis (login) LB-LINK CWE-287