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CVE Record

CVE-2021-31519: An incorrect permission vulnerability in the product installer folders for Trend Micro HouseCall for Home N...

An incorrect permission vulnerability in the product installer folders for Trend Micro HouseCall for Home Networks version 5.3.1179 and below could allow an attacker to escalate privileges by placing arbitrary code on a specified folder and have that code be executed by an Administrator who is running a scan. Please note that an attacker must first obtain the ability to execute low-privileged code on the target system to exploit this vulnerability.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-31519 is a local privilege escalation issue in Trend Micro HouseCall for Home Networks. Weak permissions on installer folders could let someone who already has low-privileged access place code that runs when an Administrator starts a scan.

Executive priority

Treat this as a targeted endpoint hygiene issue, not an internet-scale emergency. Prioritize if the product is present on shared, administrator-managed, or malware-exposed machines. No source in the bundle confirms active exploitation.

Technical view

Affected versions are Trend Micro HouseCall for Home Networks 5.3.1179 and below. The issue is incorrect permissions on product installer folders, enabling arbitrary code placement and later Administrator-context execution during scanning. The source bundle provides no CVSS, CWE, or confirmed exploitation evidence.

Likely exposure

Exposure is limited to systems running Trend Micro HouseCall for Home Networks 5.3.1179 or earlier, especially endpoints where untrusted local users or malware can execute low-privileged code.

Exploitation context

This is not described as remotely exploitable. An attacker first needs low-privileged code execution on the target, then depends on an Administrator running a scan that triggers execution from the affected folder path.

Researcher notes

Evidence is sparse: the bundle names the product, affected versions, privilege-escalation condition, and prerequisite local low-privileged execution. No CVSS, CWE, patch version, or exploit-in-the-wild evidence is provided. Use Trend Micro and ZDI references for primary confirmation.

Mitigation direction

  • Inventory Trend Micro HouseCall for Home Networks installations and versions.
  • Review Trend Micro advisory TMKA-10310 for fixed versions or vendor guidance.
  • Upgrade or remove installations at version 5.3.1179 or below per vendor guidance.
  • Restrict untrusted local code execution on affected endpoints.
  • Prioritize endpoints where administrators commonly run local scans.

Validation and detection

  • Confirm whether HouseCall for Home Networks is installed.
  • Verify installed versions against the affected range: 5.3.1179 and below.
  • Review installer folder permissions against Trend Micro guidance.
  • Check endpoint telemetry for suspicious writes to product installer folders.
  • Confirm remediation by validating the updated or removed product state.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-31519 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Trend MicroTrend Micro HouseCall for Home Networks5.3.1179 and belowListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.