PT-2025-18200 · Lb Link · Lb-Link Bl-Ac3600

Gray · Published 2025-04-29 · Updated 2025-05-02 · CVE-2025-4076

Positive Technologies (AI Summary)

CVSS v2.0

6.5

Medium

Base vector

AV:N/AC:L/Au:S/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions LB-LINK BL-AC3600 versions up to 1.0.22

Description A critical issue has been discovered, affecting the Password Handler component. Specifically, it impacts the easy uci set option string 0 function within the /cgi-bin/lighttpd.cgi file. The manipulation of the routepwd argument leads to command injection, which can be initiated remotely. The issue has been publicly disclosed, and the vendor was notified but did not respond.

Recommendations For LB-LINK BL-AC3600 versions up to 1.0.22, as a temporary workaround, consider disabling the easy uci set option string 0 function until a patch is available. Restrict access to the /cgi-bin/lighttpd.cgi file to minimize the risk of exploitation. Avoid using the routepwd argument in the affected component until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Command Injection

Special Elements Injection

Weakness Enumeration

CWE-77

CWE-74

Related Identifiers

BDU:2025-07206

CVE-2025-4076

Affected Products

Lb-Link Bl-Ac3600

References · 11

• 🔥 https://github.com/GrayLxton/BLink_poc · Exploit
• 🔥 https://github.com/GrayLxton/BLink_poc/blob/main/poc.py · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-4076 · Security Note
• https://bdu.fstec.ru/vul/2025-07206 · Security Note
• https://vuldb.com/?id.306513 · Note
• https://vuldb.com/?ctiid.306513 · Note
• https://vuldb.com/?submit.560232 · Note
• https://twitter.com/SecAideInfo/status/1918247814020088206 · Twitter Post
• https://t.me/cvedetector/24037 · Telegram Post
• https://twitter.com/CVEnew/status/1917289526856409098 · Twitter Post
• https://t.me/cvetracker/22648 · Telegram Post