Vulnerability · Published Jan 27, 2026 · Assigned by CERT-PL

CVE-2025-12387Denial of Service in Pix-Link LV-WR21Q

Medium 6.9

In plain English

A medium-severity security flaw in LV-WR21Q from Pix-Link. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.7%top 47.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability in the Pix-Link LV-WR21Q router's language module allows remote attackers to trigger a denial of service (DoS) by sending a specially crafted HTTP POST request containing non-existing language parameter. This renders the server unable to serve correct lang.js file, which causes administrator panel to not work, resulting in DoS until the language settings is reverted to a correct value. The Denial of Service affects only the administrator panel and does not affect other router functionalities. The vendor was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Only version V108_108 was tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.

Affected products (as reported)

Vendor	Product	Versions
Pix-Link	LV-WR21Q	V108_108
Pix-Link	WR21Q	V108_108

Weakness: CWE-754 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

https://cert.pl/en/posts/2026/01/CVE-2025-12386 third-party-advisory
https://www.pix-link.com/lv-wr21q product
https://github.com/wcyb/security_research exploit