# CVE-2021-47789: Yenkee Hornet Gaming Mouse - 'GM312Fltr.sys' Denial of Service (PoC)

> Attackers can crash the system by sending oversized input to the Yenkee Hornet Gaming Mouse driver, causing a kernel-level 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-h7xf-488f-xfx8

## What is CVE-2021-47789?

CVE-2021-47789 is a medium-severity memory corruption vulnerability in Yenkee Hornet 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

Yenkee Hornet Gaming Mouse driver GM312Fltr.sys contains a buffer overrun vulnerability that allows attackers to crash the system by sending oversized input. Attackers can exploit the driver by sending a 2000-byte buffer through DeviceIoControl to trigger a kernel-level system crash.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2021-47789?

It affects 1 product.


Products: Yenkee Yms 3029 Firmware.

## How do I fix CVE-2021-47789?

No fix has been published for CVE-2021-47789 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47789 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47789 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47789 and fix it if it is affected.

What it is: CVE-2021-47789 is a medium-severity memory corruption vulnerability in Yenkee Hornet 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-2021-47789 exists.

Affected product: Yenkee Hornet 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-2021-47789/ (Markdown: https://insights.sbomify.com/CVE-2021-47789/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47789
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47789
- OSV: https://osv.dev/vulnerability/CVE-2021-47789

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47789/
Summaries are generated and may contain mistakes; the official description above is the record.