Is CVE-2026-5608 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5608 being exploited in the wild.

How severe is CVE-2026-5608?

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

Is there a fix for CVE-2026-5608?

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-2026-5608 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-5608?

Check whether you run Belkin F9k1122 or Belkin F9k1122 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-2026-5608: Belkin F9K1122 stack-based buffer overflow in formWlanSetup

CVE-2026-5608 · Severity: high · CVSS 8.8 · Published 2026-04-06

A security vulnerability has been identified in the Belkin F9K1122 wireless router. This flaw exists in the device's web-based setup interface, which is used to manage Wi-Fi settings. If exploited, a remote attacker could cause the router to crash or potentially take full control of the device, leading to a complete loss of internet connectivity and the potential compromise of network traffic.

Vendors: Belkin.

Quick answers

Is CVE-2026-5608 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5608 being exploited in the wild.
How severe is CVE-2026-5608?: High severity, with a CVSS score of 8.8, published 6 April 2026.
Which products and versions are affected?: Belkin F9k1122 1.00.33.
Is there a fix for CVE-2026-5608?: 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-2026-5608 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-5608?: Check whether you run Belkin F9k1122 or Belkin F9k1122 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 F9K1122 router firmware version 1.00.33. The flaw is located within the 'formWlanSetup' function in the '/goform/formWlanSetup' file. The vulnerability is triggered when the 'webpage' argument is processed; specifically, the 'p_reboot_msg' variable is passed to a 'strcpy' function call without adequate length validation, overflowing the 'reboot_msg' buffer. An attacker with network access can exploit this by sending a specially crafted POST request. Successful exploitation can lead 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 a public exploit is available.

Affected products

Belkin F9K1122 1.00.33

Timeline

2026-04-05: disclosed: Vulnerability first reported to VulDB
2026-04-06: advisory: NVD publication date

References

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