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W30e FirmwareOperating system · Tenda

CVE-2026-24436

CRITICAL · 9.8 CVSS v3.1 Published 2026-01-26
Fix available
A fix is available. Upgrade to after 16.01.0.19 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Shenzhen Tenda W30E V2 firmware versions up to and including V16.01.0.19(5037) do not enforce rate limiting or account lockout mechanisms on authentication endpoints. This allows attackers to perform unrestricted brute-force attempts against administrative credentials.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The Tenda W30E V2 router firmware (versions up to V16.01.0.19(5037)) lacks rate limiting and account lockout protections on its administrative authentication endpoints, enabling attackers to conduct unlimited brute-force attacks against admin credentials without triggering any countermeasures.

MitigationImplement rate limiting on authentication endpoints and add account lockout mechanisms after a configurable number of failed login attempts to prevent brute-force exploitation.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
W30e FirmwareOperating system
Affected:<= 16.01.0.19\(5037\)

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the device model and firmware version
    Access the router's web interface or check via CLI/telnet/SSH. Navigate to System Status or Firmware Info page to view the exact firmware version string.
    Affected if The firmware version is Tenda W30E V2 with version <= 16.01.0.19(5037)
  2. Check if HTTP/HTTPS admin login page responds without rate limiting
    Send multiple rapid authentication requests (using curl or similar) to the router's login endpoint (typically /login or /cgi-bin/login) from an external IP. Observe if requests are throttled or blocked.
    Affected if The router accepts unlimited consecutive authentication attempts without any HTTP 429 (Too Many Requests) response or connection drops
  3. Verify account lockout configuration
    Access the router's admin panel, navigate to System Tools > Security Settings or Account Management. Look for options like 'Login Failure Lockout', 'Account Lockout', or 'Failed Login Protection'. Check if any threshold for failed attempts is configurable.
    Affected if No account lockout threshold is visible or configurable in the security settings, or the feature is absent from the menu
  4. Check authentication logs for brute force indicators
    In the router admin interface, go to System Tools > System Log or Security Log. Search for failed login attempts, IP addresses, and whether there are patterns showing many rapid failures without intervention.
    Affected if Logs show numerous failed login attempts from the same source IP without any account disablement or IP blocking occurring
  5. Confirm admin authentication endpoint is exposed
    Access the router's login page via HTTP/HTTPS (typically at http://[router-ip]/ or /cgi-bin/luci/). Verify the page loads and accepts credentials without any CAPTCHA, OTP, or rate limiting challenge.
    Affected if The login page is directly accessible and accepts unlimited login attempts without triggering any protective measures

A user is affected if they are running Tenda W30E V2 firmware version 16.01.0.19(5037) or earlier and the admin interface accepts unlimited brute-force attempts without rate limiting or account lockout protections.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 16.01.0.19
Interim mitigation

Implement rate limiting on authentication endpoints and add account lockout mechanisms after a configurable number of failed login attempts to prevent brute-force exploitation.

Recommended fix Moderate confidence

Latest available W30E firmware version (newer than V16.01.0.19(5037))

  1. 1. Visit the official Tenda support page at www.tendacn.com and navigate to the W30E product support section.
  2. 2. Download the latest available firmware version for the W30E router.
  3. 3. Access the router's web administration interface using a browser.
  4. 4. Navigate to the 'System Management' or 'Firmware Upgrade' section.
  5. 5. Upload and apply the new firmware file to the router.
  6. 6. After the upgrade completes, verify the new firmware version in the router's admin panel.
  7. 7. Change the administrator password to a strong, unique password to complete the remediation.
Caveat Firmware upgrades may reset router configuration to defaults; back up current settings before upgrading and reapply after completion

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in W30e Firmware Scoped from the published advisory
  • Consultation6.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA6.0 h
40.0 hours of engineering $6,960
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-24436 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data