CVE-2021-31518
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedTrend Micro Home Network Security 6.5.599 and earlier is vulnerable to a file-parsing vulnerability which could allow an attacker to exploit the vulnerability and cause a denial-of-service to the device. This vulnerability is similar, but not identical to CVE-2021-31517.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceTrend Micro Home Network Security versions 6.5.599 and earlier contain a file-parsing vulnerability that can be exploited to cause a denial-of-service condition on the device. The vulnerability exists in how the device processes certain file types, and exploitation leads to device unavailability.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 6.5.599CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check the device firmware versionAccess the Trend Micro Home Network Security device web interface or mobile app and navigate to Settings > Device Information > Firmware Version. Alternatively, check the device label or documentation for the installed firmware build number.Affected if The displayed firmware version is 6.5.599 or any version number lower than 6.5.599 (for example, 6.5.500, 6.5.400, etc.)
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Confirm the device is operational and processing network trafficVerify that the Home Network Security device is powered on, connected to the network, and actively monitoring. Check the device status indicator or mobile app dashboard for active status.Affected if The device is actively running and processing network data, which means the file-parsing component is in use and could be triggered by maliciously crafted files traversing the network
If the firmware version is 6.5.599 or earlier, the device is vulnerable to the denial-of-service flaw when processing specially crafted file types on the network.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor-supplied firmware update to a version newer than 6.5.599, as this is a software-level vulnerability that cannot be mitigated through network configuration alone.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-31518 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-31518 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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