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CVE-2026-5042: Belkin F9K1122 Router: Remote Attack via Unsecured Function

CVE-2026-5042 · published 7 months ago

Summary

A security flaw in the Belkin F9K1122 router's formCrossBandSwitch function can be exploited by a hacker to execute malicious code remotely. This means an attacker could potentially access and control your router. We recommend updating your router's software to the latest version to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
belkin	f9k1122_firmware	1.00.33 `cpe:2.3:o:belkin:f9k1122_firmware:1.00.33:::::::*`

Original advisory text

A security flaw has been discovered in Belkin F9K1122 1.00.33. The affected element is the function formCrossBandSwitch of the file /goform/formCrossBandSwitch of the component Parameter Handler. The manipulation of the argument webpage results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

References

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

7.4 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-119Buffer Overflow

CWE-121Stack-based Buffer Overflow

CWE-787Out-of-bounds Write

Timeline

Published29 Mar 2026

Updated4 Nov 2026

First seen29 Mar 2026

Sources

CVE-2026-5042 · NVD

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