CVE-2025-52221
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 AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, funcpara1, and funcpara2 parameters.
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 confidenceBuffer overflow vulnerability in Tenda AC6 router firmware version 15.03.05.16 in the formSetCfm function allows overflow via funcname, funcpara1, and funcpara2 parameters, potentially enabling remote code execution given the CRITICAL 9.8 CVSS score.
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= 15.03.05.16_multiCVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 Tenda AC6 router modelLog into the router web interface or check the device label/marketing packaging to confirm the model is Tenda AC6Affected if The device is not a Tenda AC6 router
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Check installed firmware versionAccess the router web management interface, typically at 192.168.0.1, and navigate to System Settings or Administration to view the firmware version. Alternatively, check via telnet/SSH if enabled.Affected if The firmware version is 15.03.05.16_multi
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Verify web interface accessibilityAttempt to access the router web interface from an external network IP address (not from inside the LAN) to determine if the management interface is exposed to the internetAffected if The web management interface is reachable from untrusted networks
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Confirm remote administration statusIn the router web interface, check under Advanced Settings or Administration for 'Remote Management' or 'Remote Administration' settings to see if it is enabledAffected if Remote administration is enabled and the web interface is internet-facing
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Test for vulnerable formSetCfm endpointSend an HTTP POST request to the router's web interface with a crafted request containing overly long strings in funcname, funcpara1, or funcpara2 parameters to observe if the device hangs, crashes, or exhibits unexpected behaviorAffected if The device accepts the request without proper length validation (results in overflow or unexpected behavior)
A user is affected if they own a Tenda AC6 router running firmware version 15.03.05.16_multi with the web management interface or remote administration accessible from untrusted networks.
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 dataApply vendor firmware update when released; as interim measure, disable remote web management and restrict administrative interface access to trusted IPs only.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 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 $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-52221 — 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-2025-52221 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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