Is CVE-2026-13516 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-13516 being exploited in the wild.

How severe is CVE-2026-13516?

High severity, with a CVSS score of 8.8, published 29 June 2026.

Is there a fix for CVE-2026-13516?

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-2026-13516 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-13516?

Check whether you run Tenda JD12L Pro 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-2026-13516: Tenda JD12L Pro stack buffer overflow in WifiGuestSet

CVE-2026-13516 · Severity: high · CVSS 8.8 · Published 2026-06-29

A security vulnerability has been identified in the Tenda JD12L Pro router, a device used to provide wireless internet connectivity. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could allow an unauthorized user to monitor network traffic or use the compromised router as a jumping-off point to attack other devices on the home or business network.

Technologies: Tenda JD12L Pro. Vendors: Tenda.

Quick answers

Is CVE-2026-13516 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-13516 being exploited in the wild.
How severe is CVE-2026-13516?: High severity, with a CVSS score of 8.8, published 29 June 2026.
Which products and versions are affected?: Tenda JD12L Pro 16.03.53.23.
Is there a fix for CVE-2026-13516?: 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-2026-13516 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-13516?: Check whether you run Tenda JD12L Pro 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 exists in the Tenda JD12L Pro router (firmware version 16.03.53.23) within the 'fromSetWifiGusetBasic' function of the '/goform/WifiGuestSet' endpoint. The vulnerability is caused by the unsafe use of the 'strcpy' function when parsing the 'shareSpeed' parameter, which lacks proper bounds checking. A remote attacker can exploit this by sending a specially crafted POST request with an oversized 'shareSpeed' value to overwrite the program's stack. Successful exploitation can lead to a Denial of Service (DoS) by crashing the web server process or arbitrary code execution by hijacking the program's return address. While some reports suggest authentication may be required (PR:L), a public Proof of Concept (PoC) indicates it may be triggerable without authentication.

Affected products

Tenda JD12L Pro 16.03.53.23

Timeline

2026-05-27: disclosed: Initial discovery and report on GitHub
2026-06-29: advisory: CVE published to NVD dataset

References

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