# CVE-2021-47786: Redragon Gaming Mouse - 'REDRAGON_MOUSE.sys' Denial of Service (PoC)

> Attackers can crash the kernel driver by sending malformed IOCTL requests to the Redragon Gaming Mouse device, causing a system denial of service.

- **Severity:** Medium 6.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Jan 2026
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-hf7c-3q9p-mcqw

## What is CVE-2021-47786?

CVE-2021-47786 is a medium-severity denial of service vulnerability in Redragon Gaming Mouse, published on 15 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Redragon Gaming Mouse driver contains a kernel-level vulnerability that allows attackers to trigger a denial of service by sending malformed IOCTL requests. Attackers can send a crafted 2000-byte buffer with specific byte patterns to the REDRAGON_MOUSE device to crash the kernel driver.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2021-47786?

It affects 14 products.


Products: Redragon Bm-4091 Firmware, Redragon M602-Ks Firmware, Redragon M602a-Rgb Firmware, Redragon M602aw-Rgb Firmware, Redragon M617-Lit Firmware, Redragon M712-Rgb Firmware, Redragon M721 Firmware, Redragon M725-Lit Firmware, Redragon M801p-Rgb Firmware, Redragon M816-Pro Firmware, Redragon M910-K Firmware, Redragon M910-Ks Firmware, Redragon M914w-Rgb Firmware, Redragon M915rgb-Wl Firmware.

## How do I fix CVE-2021-47786?

No fix has been published for CVE-2021-47786 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47786 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47786 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47786 and fix it if it is affected.

What it is: CVE-2021-47786 is a medium-severity denial of service vulnerability in Redragon Gaming Mouse, published on 15 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47786 exists.

Affected product: Redragon Gaming Mouse. 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-2021-47786/ (Markdown: https://insights.sbomify.com/CVE-2021-47786/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47786
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47786
- OSV: https://osv.dev/vulnerability/CVE-2021-47786

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47786/
Summaries are generated and may contain mistakes; the official description above is the record.