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

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MEDIUM

LB-LINK BL-AC3600 Password lighttpd.cgi easy_uci_set_option_string_0 command injection

Published Apr 29, 2025

5.3

MEDIUM

CVSS 4.0

EPSS 17.71%

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.

Affected products

Vendor LB-Link Product BL-AC3600 Default
n/a
- Version
  1.0.0
  Status
  affected
  Constraints
  -
- Version
  1.0.1
  Status
  affected
  Constraints
  -
- Version
  1.0.10
  Status
  affected
  Constraints
  -
- Version
  1.0.11
  Status
  affected
  Constraints
  -
- Version
  1.0.12
  Status
  affected
  Constraints
  -
- Version
  1.0.13
  Status
  affected
  Constraints
  -
- Version
  1.0.14
  Status
  affected
  Constraints
  -
- Version
  1.0.15
  Status
  affected
  Constraints
  -
- Version
  1.0.16
  Status
  affected
  Constraints
  -
- Version
  1.0.17
  Status
  affected
  Constraints
  -
- Version
  1.0.18
  Status
  affected
  Constraints
  -
- Version
  1.0.19
  Status
  affected
  Constraints
  -
- Version
  1.0.2
  Status
  affected
  Constraints
  -
- Version
  1.0.20
  Status
  affected
  Constraints
  -
- Version
  1.0.21
  Status
  affected
  Constraints
  -
- Version
  1.0.22
  Status
  affected
  Constraints
  -
- Version
  1.0.3
  Status
  affected
  Constraints
  -
- Version
  1.0.4
  Status
  affected
  Constraints
  -
- Version
  1.0.5
  Status
  affected
  Constraints
  -
- Version
  1.0.6
  Status
  affected
  Constraints
  -
- Version
  1.0.7
  Status
  affected
  Constraints
  -
- Version
  1.0.8
  Status
  affected
  Constraints
  -
- Version
  1.0.9
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

LB-Link

BL-AC3600

n/a

Version	Status	Constraints
1.0.0	affected	-
1.0.1	affected	-
1.0.10	affected	-
1.0.11	affected	-
1.0.12	affected	-
1.0.13	affected	-
1.0.14	affected	-
1.0.15	affected	-
1.0.16	affected	-
1.0.17	affected	-
1.0.18	affected	-
1.0.19	affected	-
1.0.2	affected	-
1.0.20	affected	-
1.0.21	affected	-
1.0.22	affected	-
1.0.3	affected	-
1.0.4	affected	-
1.0.5	affected	-
1.0.6	affected	-
1.0.7	affected	-
1.0.8	affected	-
1.0.9	affected	-

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-74

CWE-77

References (5)

https://github.com/GrayLxton/BLink_poc
exploit
https://github.com/GrayLxton/BLink_poc/blob/main/poc.py
exploit
https://vuldb.com/?ctiid.306513
signaturepermissions-required
https://vuldb.com/?id.306513
vdb-entrytechnical-description
https://vuldb.com/?submit.560232
third-party-advisory

Link	Providers	Tags
https://github.com/GrayLxton/BLink_poc		exploit
https://github.com/GrayLxton/BLink_poc/blob/main/poc.py		exploit
https://vuldb.com/?ctiid.306513		signaturepermissions-required
https://vuldb.com/?id.306513		vdb-entrytechnical-description
https://vuldb.com/?submit.560232		third-party-advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner VulDB

Published Apr 29, 2025

Updated Apr 29, 2025

Reserved Apr 29, 2025

Link CVE-2025-4076

CISA Vulnrichment

Updated Apr 29, 2025

NVD

Status Deferred

Modified Jun 17, 2026

Link CVE-2025-4076

Red Hat

Severity n/a

Public date n/a

Links CVE-2025-4076