Vulnerability · Published Mar 23, 2026 · Assigned by VulDB

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

High 8.8

In plain English

A high-severity stack buffer overflow in F9K1122 from Belkin. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.7%top 46.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Belkin	F9K1122	1.00.33

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-352403 | Belkin F9K1122 formWISP5G stack-based overflow vdb-entry, technical-description
VDB-352403 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #775132 | Belkin F9K1122 1.00.33 Stack-based Buffer Overflow third-party-advisory
https://github.com/Litengzheng/vul_db/blob/main/Belkin/vul_151/README.md related
https://github.com/Litengzheng/vul_db/blob/main/Belkin/vul_151/README.md#proof-of-concept-poc exploit