CVE-2026-4566: A flaw has been found in Belkin F9K1122 1.00.33

This month

HIGH 8.8MITIGATE

CVE-2026-4566 is a high-severity flaw (CVSS 8.8) affecting f9k1122 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-119, CWE-121
Published	2026-03-23
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: belkin

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-23 03:16 UTCPublished CVE record published
2026-06-17 10:56 UTCUpdated Record last modified

belkin f9k1122 firmware MITIGATE

Affected: 1.00.33

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.00.33

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4566?

f9k1122 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4566 being exploited?

CVE-2026-4566 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4566 affect?

CVE-2026-4566 affects f9k1122 firmware. Severity is high (CVSS 8.8). 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 lau

How urgent is CVE-2026-4566?

Priority 49/100. High severity; Public exploit reference

Related CVEs

CVE-2026-5608 HIGH 8.8 MITIGATE A vulnerability was detected in Belkin F9K1122 1.00.33
CVE-2026-5044 HIGH 8.8 MITIGATE A security vulnerability has been detected in Belkin F9K1122 1.00.33
CVE-2026-5043 HIGH 8.8 MITIGATE A weakness has been identified in Belkin F9K1122 1.00.33
CVE-2026-5042 HIGH 8.8 MITIGATE A security flaw has been discovered in Belkin F9K1122 1.00.33

References

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