CVE-2026-4566: Belkin F9K1122 formWISP5G stack-based overflow

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-23 · updated 2026-06-17
Weakness: CWE-119

Description

A flaw has been found in Belkin F9K1122 1.00.33. The affected element is the function formWISP5G of the file /goform/formWISP5G. Executing a manipulation of the argument webpage can lead to stack-based buffer overflow. The attack can be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

Belkin F9K1122: 1.00.33

References

https://github.com/Litengzheng/vul_db/blob/main/Belkin/vul_151/README.md
https://github.com/Litengzheng/vul_db/blob/main/Belkin/vul_151/README.md#proof-of-concept-poc
https://vuldb.com/?ctiid.352403
https://vuldb.com/?id.352403
https://vuldb.com/?submit.775132

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