CVE-2021-42923

Arbitrary code execution via temporary-directory DLL hijacking

Published Jul 17, 2022 · Updated Jul 9, 2026

DLL hijacking in ShowMyPC 3606 on Windows allows local users to execute arbitrary code by replacing a library in a temporary directory. The application loads wodVPN.dll from %temp%\ShowMyPC-ShowMyPC3606 without verifying that the file is trusted, so a replacement DLL runs in its process. The attacker needs local write access and a user must launch ShowMyPC; payload privileges match the logged-on user, including administrator when elevated.

CVSS severity7.3
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL hijacking in ShowMyPC 3606 on Windows allows local users to execute arbitrary code by replacing a library in a temporary directory. The application loads wodVPN.dll from %temp%\ShowMyPC-ShowMyPC3606 without verifying that the file is trusted, so a replacement DLL runs in its process. The attacker needs local write access and a user must launch ShowMyPC; payload privileges match the logged-on user, including administrator when elevated.

The record

CVE
CVE-2021-42923
Published
Jul 17, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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

7.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.001Hijack Execution Flow: DLL

Public exploit references

No public exploit references are available in this record.

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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