CVE-2020-9453Public exploit

Local denial of service via unchecked IOCTL input

Published Feb 5, 2021 · Updated Aug 4, 2024

Denial of service in Epson iProjection 2.30 and earlier allows local users to crash the host via crafted IOCTL requests to the EMP_MPAU.sys driver. The driver exposes the EMPMPAUIO device and fails to validate input values for IOCTLs 0x9C402406 and 0x9C40240A, while 0x9C402402 can trigger a null-pointer dereference. Exploitation requires local access to the Windows installation and can produce a blue-screen outage; unspecified additional impact is not established.

CVSS severity5.5
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Epson iProjection 2.30 and earlier allows local users to crash the host via crafted IOCTL requests to the EMP_MPAU.sys driver. The driver exposes the EMPMPAUIO device and fails to validate input values for IOCTLs 0x9C402406 and 0x9C40240A, while 0x9C402402 can trigger a null-pointer dereference. Exploitation requires local access to the Windows installation and can produce a blue-screen outage; unspecified additional impact is not established.

The record

CVE
CVE-2020-9453
Published
Feb 5, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9NVDAV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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