CVE-2026-4228Public exploitNetwork attack vector

Authenticated command execution via Wi-Fi parameter injection

Published Mar 16, 2026 · Updated Mar 16, 2026

Command injection in LB-LINK BL-WR9000 2.4.9 allows remote authenticated users to execute arbitrary system commands through /goform/set_wifi. The sub_458754 handler passes wlanpswencry or AuthMode through bs_SetWlanCfg to bl_set_2G_effect, where sprintf builds iwpriv commands that bl_do_system executes without validating shell metacharacters. An authenticated administrator session and a crafted Wi-Fi configuration request are required, and successful exploitation runs commands with the router's highest privileges.

CVSS severity9.8
Critical
EPSS probability12.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in LB-LINK BL-WR9000 2.4.9 allows remote authenticated users to execute arbitrary system commands through /goform/set_wifi. The sub_458754 handler passes wlanpswencry or AuthMode through bs_SetWlanCfg to bl_set_2G_effect, where sprintf builds iwpriv commands that bl_do_system executes without validating shell metacharacters. An authenticated administrator session and a crafted Wi-Fi configuration request are required, and successful exploitation runs commands with the router's highest privileges.

The record

CVE
CVE-2026-4228
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
LB-LINK
Product
BL-WR9000
Classifications
CWE-74, CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LB-LINK · BL-WR9000version=2.4.9

Published CVSS scores

2.1VulDBCVSS: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
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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