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

> Remote attackers can cause a denial of service on the Pix-Link LV-WR21Q administrator panel by sending a crafted HTTP POST request with an invalid language parameter.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Jan 2026
- **Updated:** 27 Jan 2026
- **Also known as:** GHSA-292q-v67v-f66g

## What is CVE-2025-12387?

CVE-2025-12387 is a medium-severity denial of service vulnerability in Pix-Link LV-WR21Q, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-754 (Improper Check for Unusual or Exceptional Conditions)

## Which versions are affected by CVE-2025-12387?


## How do I fix CVE-2025-12387?

No fix has been published for CVE-2025-12387 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-12387 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12387 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12387 and fix it if it is affected.

What it is: CVE-2025-12387 is a medium-severity denial of service vulnerability in Pix-Link LV-WR21Q, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12387 exists.

Affected product: Pix-Link LV-WR21Q. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-12387/ (Markdown: https://insights.sbomify.com/CVE-2025-12387/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12387
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12387
- OSV: https://osv.dev/vulnerability/CVE-2025-12387

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12387/
Summaries are generated and may contain mistakes; the official description above is the record.