CVE-2022-40102
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 · uneditedTenda i9 v1.0.0.8(3828) was discovered to contain a buffer overflow via the formwrlSSIDset function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted string.
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 confidenceBuffer overflow in Tenda i9 v1.0.0.8(3828) router's formwrlSSIDset function allows remote attackers to cause denial of service via a specially crafted string input to the vulnerable parameter.
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= 1.0.0.8\(3828\)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
- 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 router modelAccess the router admin web interface (typically at 192.168.0.1) and check the device information or system status page to confirm the model is Tenda i9Affected if Device model is not Tenda i9 - not affected
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Check firmware versionIn the router web interface, navigate to System Settings > Firmware Upgrade or System Status to view the currently installed firmware versionAffected if Firmware version is exactly 1.0.0.8(3828) - likely affected; version differs - not affected
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Verify web admin interface accessibilityConfirm whether the router web admin interface is accessible from the network. Check if it binds to WAN interface or is reachable from external networksAffected if Web interface is exposed to untrusted networks - exploitation potential exists; only accessible from LAN - lower risk but vulnerability still present in firmware
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Confirm vulnerable function presenceThe formwrlSSIDset function handles wireless SSID configuration. This can be confirmed only by firmware analysis or checking Tenda's release notes for version 1.0.0.8(3828)Affected if Running vulnerable firmware version and wireless SSID configuration is functional - vulnerability is present
User is affected if running Tenda i9 firmware version 1.0.0.8(3828) with the formwrlSSIDset function accessible via the router's web interface.
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 dataUpdate to patched firmware version when available; until then, restrict administrative interface access to trusted networks only.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-40102 — 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-2022-40102 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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