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CVE-2025-4076— LB-LINK BL-AC3600 Password lighttpd.cgi easy_uci_set_option_string_0 command injection

Quick assessment

Affected
LB-LINK BL-AC3600
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LB-LINK BL-AC3600是中国必联（LB-LINK）公司的一款双频千兆无线路由器，支持2.4GHz和5GHz频段，适用于家庭和小型办公室网络。 LB-LINK BL-AC3600 1.0.22及之前版本存在注入漏洞，该漏洞源于对参数routepwd处理不当，可能导致命令注入攻击。

CVSS 6.3 · Medium EPSS 16.91% · P97
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I. Basic Information for CVE-2025-4076

Vulnerability Information
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Vulnerability Title
LB-LINK BL-AC3600 Password lighttpd.cgi easy_uci_set_option_string_0 command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability classified as critical has been found in LB-LINK BL-AC3600 up to 1.0.22. This affects the function easy_uci_set_option_string_0 of the file /cgi-bin/lighttpd.cgi of the component Password Handler. The manipulation of the argument routepwd leads to command injection. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
LB-LINK BL-AC3600 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LB-LINK BL-AC3600是中国必联（LB-LINK）公司的一款双频千兆无线路由器，支持2.4GHz和5GHz频段，适用于家庭和小型办公室网络。 LB-LINK BL-AC3600 1.0.22及之前版本存在注入漏洞，该漏洞源于对参数routepwd处理不当，可能导致命令注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LB-LINK BL-AC3600 1.0.0 -

II. Public POCs for CVE-2025-4076

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III. Intelligence Information for CVE-2025-4076

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Vendor Advisories for CVE-2025-4076 (2)

Proof of Concept for CVE-2025-4076 (2)

IV. Related Vulnerabilities

Same product: BL-AC3600
Same vendor: LB-LINK
Same weakness: CWE-77

V. Comments for CVE-2025-4076

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