What is the CVSS score of CVE-2026-4226?

CVE-2026-4226 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Bl Wr9000 are affected by CVE-2026-4226?

A critical remote code execution vulnerability affecting LB-LINK BL-WR9000 routers (firmware 2.4.9) poses an immediate threat to organizations deploying these devices.

Is there a public PoC exploit available for CVE-2026-4226?

Yes, a public proof-of-concept exploit is available for CVE-2026-4226. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-4226?

Within 24 hours: Identify and inventory all LB-LINK BL-WR9000 devices running firmware 2.4.9 in your environment; isolate affected devices from production networks where possible; disable remote management access to the /goform/get_virtual_cfg endpoint via firewall rules. Within 7 days: Implement network segmentation to restrict router access to authorized administrators only; enable enhanced logging and monitoring on affected devices; contact LB-LINK for patch availability timeline. Within 30 days: Develop a replacement plan for vulnerable routers; migrate critical functions to alternative, patched networking equipment; conduct a full security audit of any systems that may have been compromised through these devices.

Bl Wr9000 CVE-2026-4226

EUVD-2026-12367 HIGH

Stack-based Buffer Overflow (CWE-121)

2026-03-16 VulDB

Buffer Overflow Stack Overflow Bl Wr9000

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 20, 2026 - 18:21 vuln.today

Public exploit code

EUVD ID Assigned

Mar 16, 2026 - 09:00 euvd

EUVD-2026-12367

Analysis Generated

Mar 16, 2026 - 09:00 vuln.today

CVE Published

Mar 16, 2026 - 07:32 nvd

HIGH 8.8

DescriptionCVE.org

A weakness has been identified in LB-LINK BL-WR9000 2.4.9. The affected element is the function sub_44E8D0 of the file /goform/get_virtual_cfg. Executing a manipulation can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Stack Overflow's infrastructure contains a stack-based buffer overflow in a virtual configuration function that can be exploited remotely by authenticated attackers to achieve complete system compromise. Public exploit code is available for this vulnerability, and no patch has been released despite vendor notification. An attacker with valid credentials can manipulate input to the vulnerable endpoint and execute arbitrary code with full system privileges.

Technical ContextAI

The vulnerability affects the LB-LINK BL-WR9000 router (CPE: cpe:2.3:a:lb-link:bl-wr9000:*:*:*:*:*:*:*:*), specifically version 2.4.9 as confirmed by EUVD-2026-12367. The root cause is a classic stack-based buffer overflow (CWE-121) where the application fails to properly validate input size before copying data to a fixed-size buffer on the stack. This occurs in the sub_44E8D0 function when processing requests to the /goform/get_virtual_cfg endpoint, likely related to virtual configuration management functionality in the router's web interface.

RemediationAI

No patch is currently available as the vendor has not responded to disclosure attempts. Organizations should immediately implement compensating controls including restricting network access to the router's management interface to trusted IP addresses only, disabling the vulnerable /goform/get_virtual_cfg endpoint if possible, and considering replacement with alternative router models from responsive vendors. Monitor the VulDB advisory at https://vuldb.com/?id.351149 for any future updates. Given the lack of vendor support, replacing affected devices should be strongly considered as a long-term solution.