Is CVE-2026-5683 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5683 being exploited in the wild.

How severe is CVE-2026-5683?

Medium severity, with a CVSS score of 5.5, published 6 April 2026.

Which products and versions are affected?

Tenda CX12L Router 16.03.53.12.

Is there a fix for CVE-2026-5683?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-5683 attacked?

It is attacked from the adjacent network, in a network appliance.

Am I affected by CVE-2026-5683?

Check whether you run Tenda Cx12l, Tenda CX12L Router or Tenda Cx12l Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-5683: Tenda CX12L stack buffer overflow in /goform/P2pListFilter

CVE-2026-5683 · Severity: medium · CVSS 5.5 · Published 2026-04-06

A security vulnerability exists in the Tenda CX12L router, a device used to provide wireless internet in homes and small offices. An attacker on the local network can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could allow an attacker to monitor network traffic, steal sensitive data, or use the router as a jumping-off point to attack other devices connected to the network.

Technologies: Tenda Cx12l, Tenda CX12L Router, Tenda Cx12l Firmware. Vendors: Tenda.

Quick answers

Is CVE-2026-5683 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5683 being exploited in the wild.
How severe is CVE-2026-5683?: Medium severity, with a CVSS score of 5.5, published 6 April 2026.
Which products and versions are affected?: Tenda CX12L Router 16.03.53.12.
Is there a fix for CVE-2026-5683?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-5683 attacked?: It is attacked from the adjacent network, in a network appliance.
Am I affected by CVE-2026-5683?: Check whether you run Tenda Cx12l, Tenda CX12L Router or Tenda Cx12l Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stack-based buffer overflow vulnerability exists in the Tenda CX12L router (firmware version 16.03.53.12) within the 'fromP2pListFilter' function of the '/goform/P2pListFilter' endpoint. The root cause is the unsafe use of the 'sprintf' function, which processes the user-controlled 'page' parameter into a fixed-size 256-byte buffer without proper bounds checking. An attacker on the local network can send a specially crafted POST request with an oversized 'page' argument to overwrite adjacent memory on the stack. Successful exploitation can lead to a Denial of Service (DoS) by crashing the web server or arbitrary code execution by overwriting the return address. A public proof-of-concept (PoC) exploit is available.

Affected products

Tenda CX12L Router 16.03.53.12

Timeline

2026-03-30: disclosed: Vulnerability details and PoC shared on GitHub by researcher
2026-04-06: advisory: Initial disclosure via VulDB and NVD

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.