PT-2026-4913 · Pix Link · Pix-Link Lv-Wr21Q Router

Wojciech Cybowski · Published 2026-01-27 · Updated 2026-01-27 · CVE-2025-12387

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Pix-Link LV-WR21Q router version V108 108 Pix-Link LV-WR21Q router (affected versions not specified)

Description A flaw exists in the language module of the Pix-Link LV-WR21Q router that allows remote attackers to cause a denial of service (DoS). This is achieved by sending a specially crafted HTTP POST request containing a non-existing language parameter. The server is then unable to serve the correct lang.js file, which prevents the administrator panel from functioning, resulting in a DoS. The DoS only impacts the administrator panel and does not affect other router functionalities.

Recommendations Revert the language settings to a correct value.

Exploit

Fix

DoS

Improper Check for Exceptional Conditions

Weakness Enumeration

CWE-754

Related Identifiers

CVE-2025-12387

Affected Products

Pix-Link Lv-Wr21Q Router

References · 7

• 🔥 https://github.com/wcyb/security_research · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-12387 · Security Note
• https://cert.pl/en/posts/2026/01/CVE-2025-12386 · Note
• https://twitter.com/VulmonFeeds/status/2016207617505321026 · Twitter Post
• https://t.me/cveNotify/149976 · Telegram Post
• https://twitter.com/CVEnew/status/2016128324523983254 · Twitter Post
• https://pix-link.com/lv-wr21q · Note