Is CVE-2026-5612 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5612 being exploited in the wild.

How severe is CVE-2026-5612?

High severity, with a CVSS score of 8.8, published 6 April 2026.

Is there a fix for CVE-2026-5612?

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-2026-5612 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-5612?

Check whether you run Belkin F9k1015 or Belkin F9k1015 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-2026-5612: Belkin F9K1015 stack buffer overflow in formWlEncrypt

CVE-2026-5612 · Severity: high · CVSS 8.8 · Published 2026-04-06

A security vulnerability exists in the Belkin F9K1015 wireless router. This flaw allows a remote attacker to crash the device or potentially take full control of it by sending a specially crafted web request. Such an exploit could lead to a complete loss of internet connectivity for the network or unauthorized access to the router's settings and traffic.

Technologies: Belkin F9k1015, Belkin F9k1015 Firmware. Vendors: Belkin.

Quick answers

Is CVE-2026-5612 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5612 being exploited in the wild.
How severe is CVE-2026-5612?: High severity, with a CVSS score of 8.8, published 6 April 2026.
Which products and versions are affected?: Belkin F9k1015 1.00.10.
Is there a fix for CVE-2026-5612?: 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-2026-5612 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-5612?: Check whether you run Belkin F9k1015 or Belkin F9k1015 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 Belkin F9K1015 firmware version 1.00.10. The flaw is located within the 'formWlEncrypt' function in the '/goform/formWlEncrypt' file. The vulnerability is caused by the unsafe use of the 'strcpy' function when processing the user-provided 'webpage' parameter, which is copied into a fixed-size stack buffer ('reboot_msg') without adequate length validation. A remote attacker with low privileges can exploit this by sending a POST request with an oversized 'webpage' argument, leading to a denial of service (DoS) or remote code execution (RCE). As of the advisory date, the vendor has not responded to disclosure attempts, and no patch is currently available.

Affected products

Belkin F9K1015 1.00.10

Timeline

2026-04-05: disclosed: Vulnerability disclosed via VulDB and GitHub PoC.
2026-04-06: advisory: NVD publication date.

References

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