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Ac20 FirmwareOperating system · Tenda

CVE-2025-13258

HIGH · 8.8 CVSS v3.1 Published 2025-11-17
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
94/100
Remediation priority · Urgent
Public exploit Remotely reachable 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
A vulnerability was detected in Tenda AC20 up to 16.03.08.12. The impacted element is an unknown function of the file /goform/WifiExtraSet. The manipulation of the argument wpapsk_crypto results in buffer overflow. The attack can be launched remotely. The exploit is now public and may be used.

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
How this class of weakness works · CWE-119

The program reads or writes outside the bounds of an allocated buffer, corrupting adjacent memory. With crafted input an attacker can overwrite control data and, with effort, redirect execution to their own code. Remediation ranges from bounds checking and safe library functions to compiler mitigations, usually alongside a careful audit of the surrounding code.

General guidance for the memory buffer bounds error class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Ac20 FirmwareOperating system
Affected:= 16.03.08.12

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

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
Recommended fix Moderate confidence

Any firmware version newer than 16.03.08.12 that addresses the buffer overflow in /goform/WifiExtraSet (check Tenda AC20 release notes for specific fixed version)

  1. 1. Identify the current firmware version of the Tenda AC20 router by accessing the web management interface or checking the device label
  2. 2. Navigate to the official Tenda support page at www.tenda.com.cn and locate the AC20 product downloads section
  3. 3. Check for any firmware updates newer than version 16.03.08.12 that address security vulnerabilities
  4. 4. Download the latest stable firmware version available for the AC20 model
  5. 5. Access the router's web management interface (typically at 192.168.0.1)
  6. 6. Navigate to the System Management or Firmware Upgrade section
  7. 7. Upload the downloaded firmware file and initiate the upgrade process
  8. 8. Wait for the upgrade to complete and the router to reboot (do not power off during this process)
Caveat Router firmware upgrades can sometimes reset configuration to defaults; backup current settings before upgrading

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

No vendor fix exists Ac20 Firmware has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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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-2025-13258 in production — separate from our analysis above.

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