EUVD-2026-12371Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Command injection prevention
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | While the CVSS v3.1 score is 6.3 (Medium), multiple factors elevate real-world risk: the attack vector is Network (AV:N) with Low complexity (AC:L), requires only Low privileges (PR:L—a standard user account), and produces tangible impact across Confidentiality, Integrity, and Availability. The CVSS vector indicates Proof of Concept exists (E:P). Most critically, public exploit code is available on GitHub (glkfc/IoT-Vulnerability), vendor non-response indicates no patch is forthcoming, and the vulnerability affects consumer IoT infrastructure (home routers) where authentication may be trivial or default credentials widespread. Under SSVC framework: exploitation is active/public, likely automatable, and impacts network infrastructure. This transitions from a medium CVSS rating to a high-priority remediation target due to lack of vendor responsiveness and public exploit availability. |
| Exploit ScenarioDerived | An attacker with valid credentials (obtained via credential stuffing, weak default passwords, or social engineering targeting home users) authenticates to the router's web interface and submits a crafted payload to the /goform/set_wifi endpoint that injects shell metacharacters (e.g., pipes, semicolons, backticks) into a command parameter. The sub_458754 function executes the injected commands with root-level privileges, allowing the attacker to establish a reverse shell, modify wireless settings, exfiltrate network traffic, or launch attacks against connected devices. Public proof-of-concept code from GitHub eliminates the barrier to exploitation, making this a viable attack for even unsophisticated threat actors targeting residential networks. |
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Alert meAnalysisAI
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.
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.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
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.
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Severity by source
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
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionCVE.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.
Executive ViewAI
Organizations using A vulnerability should be aware of moderate risk from CVE-2026-4228, a command injection vulnerability rated CVSS 6.3. Exploitation could allow attackers to execute code or inject malicious input. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: deploy WAF rules, restrict network access, enable logging.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
OS command injection occurs when an application passes unsanitized user input directly into system shell commands.
Exploit-DB