CVE-2021-31517
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-2021-31518.
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 confidenceA file-parsing vulnerability in Trend Micro Home Network Security versions 6.5.599 and earlier allows unauthenticated attackers to exploit the vulnerability and cause a denial-of-service to the device. The vulnerability affects the device's ability to parse certain files, leading to service disruption.
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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Identify the installed version of Trend Micro Home Network SecurityAccess the device admin interface or check the system information page to find the firmware/software version number. Compare it against the affected version 6.5.599 or earlier.Affected if The installed version is 6.5.599 or any version lower than 6.5.599.
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Confirm the device file-parsing feature is activeCheck the device status page or configuration settings to verify that file parsing or content scanning capabilities are enabled on the Home Network Security device.Affected if File parsing or content scanning features are turned on and the device is actively processing files.
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Verify the device is reachable on the networkConfirm the Home Network Security device has an active network connection and is accessible to potential attackers on the local network or remotely depending on configuration.Affected if The device is network-accessible and processing incoming data or files.
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Check device uptime and service statusMonitor the device for unexpected restarts, service disruptions, or sudden outages that may indicate the denial-of-service condition has been triggered.Affected if The device experiences unexplained service disruptions or becomes unresponsive after processing certain files.
A user is affected if their Trend Micro Home Network Security firmware version is 6.5.599 or earlier and the file-parsing functionality is enabled on the device.
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 dataUpgrade Trend Micro Home Network Security to a version newer than 6.5.599 or apply vendor-supplied patches to remediate this file-parsing denial-of-service vulnerability.
- Consultation2.0 h
- Implementation1.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-31517 — 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-2021-31517 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
- No spam, self-promotion, credentials, or personal data