HIGH CVSS 7.2
Published: 2025-07-26

CVE-2025-8181

totolink n600r_firmware Security Advisory (CVE-2025-8181)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2025-8181 impacting totolink n600r_firmware. Evaluated with CVSS Base Score of 7.2 (HIGH).

Original NVD Description

Source: NIST NVD
A vulnerability, which was classified as critical, was found in TOTOLINK N600R and X2000R 1.0.0.1. This affects an unknown part of the file vsftpd.conf of the component FTP Service. The manipulation leads to least privilege violation. It is possible to initiate the attack remotely.

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Network (AV:N)
Exploitable remotely across internet boundaries
Attack Complexity
Low (AC:L)
No specialized conditions required
Privileges Required
High (PR:H)
Administrative credentials required
User Interaction
None (UI:N)
Zero human interaction required
Scope
Unchanged (S:U)
Confined to same security context
Confidentiality
High (C:H)
Total information disclosure
Integrity
High (I:H)
Total modification of target system
Availability
High (A:H)
Total denial of service or shutdown

🎯 Affected Versions Matrix

Affected Product totolink / n600r_firmware
Affected Versions 4.3.0
Weakness Enumeration CWE-266

Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe

High-Intent Research Tool

Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-2025-8181 impacting totolink n600r_firmware.

⚡ Nuclei Detection Template (YAML) cve-2025-8181.yaml
id: cve-2025-8181

info:
  name: totolink n600r_firmware - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: high
  description: |
    Automated signature & scanner for CVE-2025-8181 affecting totolink n600r_firmware.
    Evaluation: A vulnerability, which was classified as critical, was found in TOTOLINK N600R and X2000R 1.0.0.1. This affects an unknown part of the file vsftpd.con...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2025-8181
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 7.2
    cve-id: CVE-2025-8181
    cwe-id: CWE-266
  tags: cve,cve-2025-8181,totolink,n600r_firmware,high

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "n600r_firmware"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2025-8181.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2025-8181
# Target: totolink n600r_firmware | CVSS: 7.2 (HIGH)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2025-8181 (totolink n600r_firmware)...")
    headers = {
        "User-Agent": "CyberVault-Audit-Scanner/2.0",
        "Accept": "*/*"
    }
    try:
        r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
        print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
        if r.status_code < 500:
            print(f"[!] Target reachable. Verify version against totolink n600r_firmware scope (4.3.0).")
        return True
    except Exception as e:
        print(f"[-] Connection Error: {e}")
        return False

if __name__ == '__main__':
    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
    verify_vulnerability(url)
🛡️ Quick Patch & Remediation Script (Bash) patch_cve-2025-8181.sh
# Recommended Remediation & Patching Commands for CVE-2025-8181
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install n600r_firmware 2>/dev/null || \
sudo dnf upgrade n600r_firmware 2>/dev/null || \
sudo yum update n600r_firmware

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i n600r_firmware 2>/dev/null || rpm -qa | grep -i n600r_firmware

# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."

🛡️ Remediation & Security Action

  • Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
  • Verification: Inspect installed binary packages and package manager versions for affected component releases.
  • Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
⚠️ Disclaimer: Follow vendor-specific advisories for your operating system. CyberVault does not fabricate unsupported remediation scripts.

🔗 Verified Technical References

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2025-8181 in totolink n600r_firmware?

Review vendor-specific security notices and update totolink n600r_firmware packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.

Is there an active exploit or public PoC for CVE-2025-8181?

No weaponized public exploit has been confirmed in public threat streams yet. Continuous surveillance is active across GitHub and security feeds.

What is the CVSS 3.1 severity rating and impact for CVE-2025-8181?

CVE-2025-8181 is classified with a CVSS 3.1 Base Score of 7.2 (HIGH). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
7.2
HIGH SEVERITY
CVE ID CVE-2025-8181
Weakness CWE-266
Vendor totolink
Product n600r_firmware
Published 2025-07-26
Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H