CVE-2021-25247

Privilege escalation via PATH-based DLL hijacking

Published Jan 27, 2021 · Updated Aug 3, 2024

DLL hijacking in Trend Micro HouseCall for Home Networks 5.3.1063 and earlier allows local users to execute code as Administrator. The Windows application searches PATH directories for a particular DLL and loads an attacker-placed copy without constraining the search location. Exploitation requires local login access, control of a searched directory, and execution of the affected program; successful code inherits administrator rights.

CVSS severity7.8
High
EPSS probability0.75%
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 Trend Micro HouseCall for Home Networks 5.3.1063 and earlier allows local users to execute code as Administrator. The Windows application searches PATH directories for a particular DLL and loads an attacker-placed copy without constraining the search location. Exploitation requires local login access, control of a searched directory, and execution of the affected program; successful code inherits administrator rights.

The record

CVE
CVE-2021-25247
Published
Jan 27, 2021
Updated
Aug 3, 2024
Vendor
Trend Micro
Product
Trend Micro HouseCall for Home Networks
Classifications
CWE-427, T1574.007
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 27, 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=5.3.1063 and below

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Trend Micro · Trend Micro HouseCall for Home Networksversion=5.3.1063 and below

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.7JPCERT/CCCVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.007Path Interception by PATH Environment Variable

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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