CVE-2025-7574: LB-LINK BL-WR9000 Web Interface lighttpd.cgi restore improper authentication

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-14 · updated 2026-06-17
Weakness: CWE-287

Description

A vulnerability, which was classified as critical, was found in LB-LINK BL-AC1900, BL-AC2100_AZ3, BL-AC3600, BL-AX1800, BL-AX5400P and BL-WR9000 up to 20250702. Affected is the function reboot/restore of the file /cgi-bin/lighttpd.cgi of the component Web Interface. The manipulation leads to improper authentication. It is possible to launch 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.

Affected products

LB-LINK BL-AC1900: 20250702
LB-LINK BL-AC2100_AZ3: 20250702
LB-LINK BL-AC3600: 20250702
LB-LINK BL-AX1800: 20250702
LB-LINK BL-AX5400P: 20250702
LB-LINK BL-WR9000: 20250702

References

https://github.com/waiwai24/0101/blob/main/CVEs/Blink/Privilege_Control_Defect_in_Blink_Router_Web_Interface_Permits_Arbitrary_Sensitive_Operation_Execution.md
https://github.com/waiwai24/0101/blob/main/CVEs/Blink/Privilege_Control_Defect_in_Blink_Router_Web_Interface_Permits_Arbitrary_Sensitive_Operation_Execution.md#poc
https://vuldb.com/?ctiid.316272
https://vuldb.com/?id.316272
https://vuldb.com/?submit.608018
https://github.com/waiwai24/0101/blob/main/CVEs/Blink/Privilege_Control_Defect_in_Blink_Router_Web_Interface_Permits_Arbitrary_Sensitive_Operation_Execution.md
https://github.com/waiwai24/0101/blob/main/CVEs/Blink/Privilege_Control_Defect_in_Blink_Router_Web_Interface_Permits_Arbitrary_Sensitive_Operation_Execution.md#poc

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