CVE-2021-4144
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 · uneditedTP-Link wifi router TL-WR802N V4(JP), with firmware version prior to 211202, is vulnerable to OS command injection.
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 · high confidenceThe TP-Link TL-WR802N V4(JP) wireless router contains an OS command injection vulnerability in firmware versions prior to 211202, allowing remote attackers to execute arbitrary operating system commands on the affected device.
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< 211202CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 device modelLocate the device label on the TP-Link TL-WR802N router or access the admin web interface (typically at 192.168.0.1 or 192.168.1.1) to confirm the model is TL-WR802N V4(JP)Affected if The device is a TP-Link TL-WR802N V4(JP)
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Check the installed firmware versionLog into the router admin panel, navigate to the Status or System section, and locate the firmware version field. Alternatively, check the version displayed on the device label or use the TP-Link Tether appAffected if The firmware version shown is less than 211202 (for example, 210601, 201xxx, etc.)
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Verify firmware version via diagnostic fileAccess the router diagnostics page or download the system log file from the admin interface to confirm the exact firmware build numberAffected if The diagnostic output or log file shows a version number below 211202
You are affected if you have a TP-Link TL-WR802N V4(JP) router running firmware version lower than 211202, as this version range contains the OS command injection vulnerability.
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.
dbcve · scoped211202
Upgrade the TP-Link TL-WR802N V4(JP) firmware to version 211202 or later to remediate the OS command injection vulnerability.
TP-Link TL-WR802N V4 firmware version 211202 or later
- 1. Download the official firmware version 211202 or later for TP-Link TL-WR802N V4 from the official TP-Link support website (www.tp-link.com)
- 2. Connect your computer to the router via Ethernet cable or Wi-Fi
- 3. Open a web browser and access the router's web management interface (typically at 192.168.0.1 or 192.168.1.1)
- 4. Log in with your administrator credentials
- 5. Navigate to the 'System Tools' or 'Firmware Upgrade' section
- 6. Click 'Browse' or 'Choose File' and select the downloaded firmware file
- 7. Click 'Upgrade' or 'Update' to begin the firmware update process
- 8. Wait for the upgrade to complete - do not power off the router during this process
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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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-2021-4144 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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- Version or environment caveats, and links to real fixes
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