HIGH CVSS 8.8
Published: 2021-02-02

CVE-2021-25310

belkin linksys_wrt160nl_firmware Security Advisory (CVE-2021-25310)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2021-25310 impacting belkin linksys_wrt160nl_firmware. Evaluated with CVSS Base Score of 8.8 (HIGH).

Original NVD Description

Source: NIST NVD
The administration web interface on Belkin Linksys WRT160NL 1.0.04.002_US_20130619 devices allows remote authenticated attackers to execute system commands with root privileges via shell metacharacters in the ui_language POST parameter to the apply.cgi form endpoint. This occurs in do_upgrade_post in mini_httpd. NOTE: This vulnerability only affects products that are no longer supported by the maintaine

📊 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
Low (PR:L)
Standard user access 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 belkin / linksys_wrt160nl_firmware
Affected Versions 1.0.04.002_us_20130619
Weakness Enumeration CWE-78

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-2021-25310 impacting belkin linksys_wrt160nl_firmware.

⚡ Nuclei Detection Template (YAML) cve-2021-25310.yaml
id: cve-2021-25310

info:
  name: belkin linksys_wrt160nl_firmware - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: high
  description: |
    Automated signature & scanner for CVE-2021-25310 affecting belkin linksys_wrt160nl_firmware.
    Evaluation: The administration web interface on Belkin Linksys WRT160NL 1.0.04.002_US_20130619 devices allows remote authenticated attackers to execute system com...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2021-25310
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2021-25310
    cwe-id: CWE-78
  tags: cve,cve-2021-25310,belkin,linksys_wrt160nl_firmware,high

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "linksys_wrt160nl_firmware"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2021-25310.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2021-25310
# Target: belkin linksys_wrt160nl_firmware | CVSS: 8.8 (HIGH)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2021-25310 (belkin linksys_wrt160nl_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 belkin linksys_wrt160nl_firmware scope (1.0.04.002_us_20130619).")
        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-2021-25310.sh
# Recommended Remediation & Patching Commands for CVE-2021-25310
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install linksys_wrt160nl_firmware 2>/dev/null || \
sudo dnf upgrade linksys_wrt160nl_firmware 2>/dev/null || \
sudo yum update linksys_wrt160nl_firmware

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i linksys_wrt160nl_firmware 2>/dev/null || rpm -qa | grep -i linksys_wrt160nl_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.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2021-25310 in belkin linksys_wrt160nl_firmware?

Review vendor-specific security notices and update belkin linksys_wrt160nl_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-2021-25310?

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-2021-25310?

CVE-2021-25310 is classified with a CVSS 3.1 Base Score of 8.8 (HIGH). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
8.8
HIGH SEVERITY
CVE ID CVE-2021-25310
Weakness CWE-78
Vendor belkin
Product linksys_wrt160nl_firmware
Published 2021-02-02
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H