CVE-2023-40193
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 · uneditedDeco M4 firmware versions prior to 'Deco M4(JP)_V2_1.5.8 Build 20230619' allows a network-adjacent authenticated attacker to execute arbitrary OS commands.
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 Deco M4 wireless mesh router contains a command injection vulnerability in its firmware. An attacker who has network adjacency to the device and valid authentication credentials can send specially crafted requests to the management interface that allow execution of arbitrary operating system commands on the underlying Linux-based firmware.
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< 1.5.8CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/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 modelAccess the router's web management interface or check the device label to confirm it is a Deco M4 unit.Affected if The device is not a Deco M4, this CVE does not apply.
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Check the firmware versionLog into the Deco management interface, navigate to Settings > Device > About, or use the Deco mobile app to view the current firmware version. Alternatively, access the router via SSH and run 'cat /proc/uptime' or check /etc/version if accessible.Affected if The installed firmware version is below 1.5.8 (for example, 1.4.x or 1.5.0).
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Verify management interface accessibilityDetermine if the router's web management interface (HTTP/HTTPS on ports 80/443 or the Deco app port) is reachable from untrusted networks. Check router firewall rules and port forwarding configurations.Affected if The management interface is exposed to the internet or an untrusted network, increasing the attack surface.
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Assess authentication statusDetermine whether default administrative credentials are still in use, or if the admin account uses a weak or guessable password.Affected if Valid authentication credentials are required for this command injection to be exploitable; compromised or weak credentials enable the attack path.
A user is affected if they own a Deco M4 device running firmware version lower than 1.5.8 with its management interface accessible to an attacker who possesses valid credentials.
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 · scoped1.5.8
Upgrade Deco M4 firmware to version 'Deco M4(JP)_V2_1.5.8 Build 20230619' or later. Restrict management interface access to trusted networks and change default administrative credentials.
Deco M4(JP)_V2_1.5.8 Build 20230619 or later
- 1. Identify the current Deco M4 firmware version through the TP-Link Deco app or web management interface
- 2. Navigate to the firmware update section in the Deco M4 management interface
- 3. Check for available updates and ensure version 1.5.8 or later is offered
- 4. Download and apply firmware version 'Deco M4(JP)_V2_1.5.8 Build 20230619' or any subsequent version
- 5. Verify the firmware update was successful by checking the new version number
- 6. After update, ensure the device is reconfigured properly if settings were preserved
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-40193 — 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-2023-40193 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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