Is CVE-2026-11504 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-11504 being exploited in the wild.

How severe is CVE-2026-11504?

High severity, with a CVSS score of 8.8, published 8 June 2026.

Which products and versions are affected?

Tenda Cx12l Firmware 16.03.53.12.

Is there a fix for CVE-2026-11504?

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-2026-11504 attacked?

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

Am I affected by CVE-2026-11504?

Check whether you run 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-2026-11504: Tenda CX12L buffer overflow in setSchedWifi

CVE-2026-11504 · Severity: high · CVSS 8.8 · Published 2026-06-08

A security vulnerability exists in the Tenda CX12L router's Wi-Fi scheduling feature. An attacker can exploit this flaw to crash the router's management interface or potentially take control of the device. This could lead to a complete loss of internet connectivity for the network or unauthorized access to the router's settings.

Technologies: Tenda Cx12l Firmware. Vendors: Tenda.

Quick answers

Is CVE-2026-11504 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-11504 being exploited in the wild.
How severe is CVE-2026-11504?: High severity, with a CVSS score of 8.8, published 8 June 2026.
Which products and versions are affected?: Tenda Cx12l Firmware 16.03.53.12.
Is there a fix for CVE-2026-11504?: 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-2026-11504 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-11504?: Check whether you run 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 exists in the 'setSchedWifi' function within the '/goform/openSchedWifi' endpoint of Tenda CX12L firmware version 16.03.53.12. The vulnerability is caused by the use of the unsafe 'strcpy' function to copy user-supplied 'schedStartTime' and 'schedEndTime' parameters into a fixed-size 25-byte heap-allocated buffer without length validation. A remote attacker with low privileges can provide oversized strings to trigger the overflow, leading to memory corruption, a crash of the 'httpd' process (DoS), or potential arbitrary code execution. A public exploit (PoC) has been released.

Affected products

Tenda CX12L Router Firmware 16.03.53.12

Timeline

2026-05-22: disclosed: Vulnerability details and PoC shared on GitHub.
2026-06-08: advisory: CVE-2026-11504 published in NVD.

References

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