LOW CVSS 3.9
Published: 2025-06-16

CVE-2025-6139

totolink t10_firmware Security Advisory (CVE-2025-6139)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2025-6139 impacting totolink t10_firmware. Evaluated with CVSS Base Score of 3.9 (LOW).

Original NVD Description

Source: NIST NVD
A vulnerability, which was classified as problematic, has been found in TOTOLINK T10 4.1.8cu.5207. Affected by this issue is some unknown functionality of the file /etc/shadow.sample. The manipulation leads to use of hard-coded password. The attack can only be initiated within the local network. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used.

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Adjacent (AV:A)
Requires shared subnet / local network access
Attack Complexity
High (AC:H)
Depends on race conditions or environment
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
Low (C:L)
Partial information leakage
Integrity
Low (I:L)
Partial data modification possible
Availability
Low (A:L)
Partial service performance degradation

🎯 Affected Versions Matrix

Affected Product totolink / t10_firmware
Affected Versions 4.1.8cu.5207_b20210320
Weakness Enumeration CWE-255

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-2025-6139 impacting totolink t10_firmware.

⚡ Nuclei Detection Template (YAML) cve-2025-6139.yaml
id: cve-2025-6139

info:
  name: totolink t10_firmware - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: low
  description: |
    Automated signature & scanner for CVE-2025-6139 affecting totolink t10_firmware.
    Evaluation: A vulnerability, which was classified as problematic, has been found in TOTOLINK T10 4.1.8cu.5207. Affected by this issue is some unknown functionalit...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2025-6139
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
    cvss-score: 3.9
    cve-id: CVE-2025-6139
    cwe-id: CWE-255
  tags: cve,cve-2025-6139,totolink,t10_firmware,low

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "t10_firmware"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2025-6139.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2025-6139
# Target: totolink t10_firmware | CVSS: 3.9 (LOW)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2025-6139 (totolink t10_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 t10_firmware scope (4.1.8cu.5207_b20210320).")
        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-2025-6139.sh
# Recommended Remediation & Patching Commands for CVE-2025-6139
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install t10_firmware 2>/dev/null || \
sudo dnf upgrade t10_firmware 2>/dev/null || \
sudo yum update t10_firmware

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i t10_firmware 2>/dev/null || rpm -qa | grep -i t10_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-2025-6139 in totolink t10_firmware?

Review vendor-specific security notices and update totolink t10_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-2025-6139?

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-2025-6139?

CVE-2025-6139 is classified with a CVSS 3.1 Base Score of 3.9 (LOW). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
3.9
LOW SEVERITY
CVE ID CVE-2025-6139
Weakness CWE-255
Vendor totolink
Product t10_firmware
Published 2025-06-16
Vector CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L