CVE-2026-12814
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 · uneditedA flaw has been found in Comfast CF-WR631AX V3 up to 2.7.0.8. This issue affects the function system of the file /cgi-bin/mbox-config?section=ping_config of the component API Endpoint. This manipulation of the argument destination causes os command injection. The attack is possible to be carried out remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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 confidenceOS command injection vulnerability in Comfast CF-WR631AX V3 routers (firmware up to 2.7.0.8). The ping_config API endpoint at /cgi-bin/mbox-config does not sanitize the destination parameter before passing it to a system() call, allowing remote attackers to execute arbitrary OS commands.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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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Confirm router modelAccess the router's web admin interface or check the device label to verify the exact model is Comfast CF-WR631AX V3Affected if The device is not a Comfast CF-WR631AX V3 router
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Check firmware versionLog into the router web interface, navigate to System or Status settings, and locate the firmware version. Compare against 2.7.0.8Affected if Firmware version is 2.7.0.8 or lower
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Verify web interface accessibilityAttempt to access http://[router-ip]/cgi-bin/mbox-config from the local network. Check if the endpoint responds to HTTP requestsAffected if The /cgi-bin/mbox-config endpoint is accessible and responds
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Check for unauthorized access indicatorsReview router logs for suspicious commands or unexpected POST requests to /cgi-bin/mbox-config. Look for shell metacharacters (;, |, &, `, $()) in logged parametersAffected if Logs show suspicious requests containing command separators to the ping_config endpoint or unexpected shell executions
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Inspect for remote access malwareFrom a trusted host, run a network scan of the router for unfamiliar open ports or services. Check for unexplained processes if telnet/ssh access is availableAffected if Unusual services listening on unexpected ports or unknown processes exist on the device
The device is affected if it is a Comfast CF-WR631AX V3 router running firmware version 2.7.0.8 or lower, and the web interface (specifically the /cgi-bin/mbox-config endpoint) is accessible.
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 dataRestrict access to the router's web management interface (disable WAN access, use firewall rules). If available, upgrade to a patched firmware version. Consider disabling the ping functionality if not required.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-12814 — 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-2026-12814 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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