How severe is CVE-2026-4227?

CVE-2026-4227 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-4227 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4227?

CVE-2026-4227 affects Lb-link Bl-wr9000 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4227?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-4227 have an EU (EUVD) identifier?

Yes. CVE-2026-4227 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12369.

When was CVE-2026-4227 published?

CVE-2026-4227 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-4227

CVE-2026-4227 is a high-severity vulnerability in Lb-link Bl-wr9000 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12369
Weakness: CWE-125
Affected product: Lb-link Bl-wr9000 Firmware
Published: 2026-03-16
Last modified: 2026-06-17

Description

A security vulnerability has been detected in LB-LINK BL-WR9000 2.4.9. The impacted element is the function sub_44D844 of the file /goform/get_hidessid_cfg. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2026-4227?: A security vulnerability has been detected in LB-LINK BL-WR9000 2.4.9. The impacted element is the function sub_44D844 of the file /goform/get_hidessid_cfg. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2026-4227?: CVE-2026-4227 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-4227 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4227?: CVE-2026-4227 affects Lb-link Bl-wr9000 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4227?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-4227 have an EU (EUVD) identifier?: Yes. CVE-2026-4227 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12369.
When was CVE-2026-4227 published?: CVE-2026-4227 was published on 2026-03-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:lb-link:bl-wr9000_firmware:2.4.9:*:*:*:*:*:*:*

More vulnerabilities in Lb-link Bl-wr9000 Firmware

CVE-2023-26801 — Critical (CVSS 9.8): LB-LINK BL-AC1900_2.0 v1.0.1, LB-LINK BL-WR9000 v2.4.9, LB-LINK BL-X26 v1.2.5, and LB-LINK BL-LTE300 v1.0.8 were…
CVE-2026-4226 — High (CVSS 8.8): A weakness has been identified in LB-LINK BL-WR9000 2.4.9. The affected element is the function sub_44E8D0 of the file…
CVE-2026-4228 — Medium (CVSS 6.3): A vulnerability was detected in LB-LINK BL-WR9000 2.4.9. This affects the function sub_458754 of the file…

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