CVE-2021-22961Network attack vector

Code execution via installer DLL search path

Published Oct 18, 2021 · Updated Aug 3, 2024

Code injection in GlassWire 2.1.167 allows attackers to execute arbitrary code via a crafted DLL loaded when its Windows installer first runs. The installer searches the user-controlled launch directory for DLL dependencies and loads a planted DLL instead of a trusted copy. Attackers must place the DLL in that directory and induce installer execution; the injected code then runs with the installer process privileges.

CVSS severity9.8
Critical
EPSS probability1.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in GlassWire 2.1.167 allows attackers to execute arbitrary code via a crafted DLL loaded when its Windows installer first runs. The installer searches the user-controlled launch directory for DLL dependencies and loads a planted DLL instead of a trusted copy. Attackers must place the DLL in that directory and induce installer execution; the injected code then runs with the installer process privileges.

The record

CVE
CVE-2021-22961
Published
Oct 18, 2021
Updated
Aug 3, 2024
Vendor
SecureMix LLC
Product
GlassWire
Classifications
CWE-94, T1574.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 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=Fixed version 2.3.335

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SecureMix LLC · GlassWireversion=Fixed version 2.3.335

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1574.001DLL Search Order Hijacking

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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