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CVE-2021-47786

Redragon Bm-4091 Firmware buffer overflow

7.5 HIGHPublic exploitEPSS 0.49%
  1. Published15 Jan 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Redragon Bm-4091 Firmwareall versions
Redragon M602a-rgb Firmwareall versions
Redragon M602aw-rgb Firmwareall versions
Redragon M602-ks Firmwareall versions
Redragon M617-lit Firmwareall versions
Redragon M712-rgb Firmwareall versions
Redragon M721 Firmwareall versions
Redragon M725-lit Firmwareall versions
Redragon M801p-rgb Firmwareall versions
Redragon M816-pro Firmwareall versions
Redragon M910-k Firmwareall versions
Redragon M910-ks Firmwareall versions
Redragon M914w-rgb Firmwareall versions
Redragon M915rgb-wl Firmwareall versions

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2021-47786 being actively exploited?

CVE-2021-47786 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.49%.

How severe is CVE-2021-47786?

CVE-2021-47786 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.49% probability of exploitation.

Which products are affected by CVE-2021-47786?

Affected products include Redragon Bm-4091 Firmware, Redragon M602a-rgb Firmware, Redragon M602aw-rgb Firmware, Redragon M602-ks Firmware, Redragon M617-lit Firmware, and 9 more.

How do I fix CVE-2021-47786?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-47786 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.