CVE-2021-20726

Code execution via installer-directory DLL loading

Published May 24, 2021 · Updated Aug 3, 2024

DLL search-path hijacking in the Overwolf Installer 2.168.0.n and earlier allows local users to execute code via a Trojan DLL. The installer resolves DLL dependencies through its own directory and loads a malicious DLL placed there instead of a trusted library. Exploitation requires the DLL to be placed beside the installer and a user to run it; the code inherits that user's privileges.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL search-path hijacking in the Overwolf Installer 2.168.0.n and earlier allows local users to execute code via a Trojan DLL. The installer resolves DLL dependencies through its own directory and loads a malicious DLL placed there instead of a trusted library. Exploitation requires the DLL to be placed beside the installer and a user to run it; the code inherits that user's privileges.

The record

CVE
CVE-2021-20726
Published
May 24, 2021
Updated
Aug 3, 2024
Vendor
Overwolf
Product
Overwolf
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.168.0.n and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Overwolf · Overwolfversion=2.168.0.n and earlier

Published CVSS scores

6.8JPCERT/CCAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P
7.8JPCERT/CCCVSS:3.0/AV:L/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
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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