# CVE-2026-5613: Belkin F9K1015 stack-based buffer overflow in formReboot

Source: https://junglewise.ai/threats/cve-2026-5613-belkin-f9k1015-stack-based-buffer-overflow-in-formreboot  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-06. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-5613 · Severity: high · CVSS 8.8 · Published 2026-04-06

A security vulnerability exists in the Belkin F9K1015 wireless router that could allow an attacker to take control of the device. By sending a specially crafted request to the router's reboot function, an attacker can cause the system to crash or execute unauthorized commands. This could lead to a total loss of device availability, interception of network traffic, or unauthorized access to the home or office network.

Technologies: [Belkin F9k1015](https://junglewise.ai/threats/technologies/f9k1015), [Belkin F9k1015 Firmware](https://junglewise.ai/threats/technologies/f9k1015-firmware). Vendors: [Belkin](https://junglewise.ai/threats/vendors/belkin).

## Quick answers

**Is CVE-2026-5613 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5613 being exploited in the wild.

**How severe is CVE-2026-5613?** 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-2026-5613?** 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-2026-5613 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-5613?** 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 'formReboot' function within the '/goform/formReboot' component of Belkin F9K1015 firmware version 1.00.10. The issue stems from the unsafe use of the 'strcpy' function when processing the user-supplied 'webpage' argument, which lacks proper length validation before being copied into the 'ok_msg' buffer. A remote attacker with low privileges can exploit this by sending a malicious POST request containing an oversized string, leading to memory corruption. This can result in a denial of service (system crash) or potentially remote code execution (RCE). A public exploit (PoC) is available, and the vendor has reportedly not responded to disclosure attempts.

## Affected products

- Belkin F9K1015 1.00.10

## Timeline

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

## References

- [https://github.com/Litengzheng/vuldb_new/blob/main/Belkin%20F9K1015/vul_10/README.md](https://github.com/Litengzheng/vuldb_new/blob/main/Belkin%20F9K1015/vul_10/README.md)
- [https://vuldb.com/submit/785552](https://vuldb.com/submit/785552)
- [https://vuldb.com/vuln/355404](https://vuldb.com/vuln/355404)
- [https://vuldb.com/vuln/355404/cti](https://vuldb.com/vuln/355404/cti)

## Related threats

- [Belkin F9K1015 stack-based buffer overflow in formSetFirewall](https://junglewise.ai/threats/cve-2026-5629-belkin-f9k1015-stack-based-buffer-overflow-in-formsetfirewall)
- [Belkin F9K1015 stack overflow in formSetSystemSettings](https://junglewise.ai/threats/cve-2026-5628-belkin-f9k1015-stack-overflow-in-formsetsystemsettings)
- [Belkin F9K1015 stack buffer overflow in formSetPassword](https://junglewise.ai/threats/cve-2026-5614-belkin-f9k1015-stack-buffer-overflow-in-formsetpassword)
- [Belkin F9K1015 stack buffer overflow in formWlEncrypt](https://junglewise.ai/threats/cve-2026-5612-belkin-f9k1015-stack-buffer-overflow-in-formwlencrypt)
- [Belkin F9K1015 stack-based buffer overflow in formCrossBandSwitch](https://junglewise.ai/threats/cve-2026-5611-belkin-f9k1015-stack-based-buffer-overflow-in-formcrossbandswitch)