Which versions of Bl Wr9000 are affected by CVE-2026-4228?

Organizations using A vulnerability should be aware of moderate risk from CVE-2026-4228, a command injection vulnerability rated CVSS 6.3.

Is there a public PoC exploit available for CVE-2026-4228?

Yes, a public proof-of-concept exploit is available for CVE-2026-4228. Prioritise patching immediately. EPSS: 0.8%.

How to fix or mitigate CVE-2026-4228?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Validate input sanitization for user-controlled parameters.

Bl Wr9000 CVE-2026-4228

Q: What is the CVSS score of CVE-2026-4228?

CVE-2026-4228 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.8%.

EUVD-2026-12371 LOW

Command Injection (CWE-77)

2026-03-16 VulDB

Command Injection Bl Wr9000

2.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.1 LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

6.3 (MEDIUM) 2.1 (LOW)

PoC Detected

Mar 20, 2026 - 18:19 vuln.today

Public exploit code

EUVD ID Assigned

Mar 16, 2026 - 09:00 euvd

EUVD-2026-12371

Analysis Generated

Mar 16, 2026 - 09:00 vuln.today

CVE Published

Mar 16, 2026 - 08:02 nvd

MEDIUM 6.3

DescriptionCVE.org

A vulnerability was detected in LB-LINK BL-WR9000 2.4.9. This affects the function sub_458754 of the file /goform/set_wifi. The manipulation results in command injection. It is possible to launch the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Command injection in LB-LINK BL-WR9000 2.4.9 via the /goform/set_wifi endpoint allows authenticated remote attackers to execute arbitrary commands with network access. Public exploit code is available for this vulnerability, and no patch has been released by the vendor despite early disclosure notification.

Technical ContextAI

The vulnerability is classified as CWE-77 (Improper Neutralization of Special Elements used in a Command, a.k.a. Command Injection). The affected product is the LB-LINK BL-WR9000 router (CPE: cpe:2.3:a:lb-link:bl-wr9000:*:*:*:*:*:*:*:*), specifically firmware version 2.4.9. The flaw resides in the web interface's /goform/set_wifi handler, which fails to properly sanitize user-supplied input before passing it to shell command execution. This allows an attacker with valid credentials to break out of intended command contexts and execute arbitrary system-level commands on the router's underlying Linux-based operating system.

RemediationAI

No official firmware patch is available from LB-LINK due to vendor non-responsiveness. Users should immediately upgrade to alternative router firmware or equipment from vendors with active security support. If continued use is unavoidable, restrict network access to the web administration interface (typically port 80/443) using firewall rules to permit only trusted IP ranges, change all default credentials, and disable remote administration features. Consider deploying the router behind a network segmentation boundary that limits its access to critical systems. Monitor exploit activity and maintain offline backups of critical configurations. Reference the VulDB advisory at https://vuldb.com/?id.351151 for additional technical context and community-contributed mitigations.