CVE-2026-3044
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 vulnerability has been found in Tenda AC8 16.03.34.06. This affects the function webCgiGetUploadFile of the file /cgi-bin/UploadCfg of the component Httpd Service. The manipulation of the argument boundary leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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 confidenceA stack-based buffer overflow vulnerability exists in the Tenda AC8 router firmware (v16.03.34.06) within the Httpd service's webCgiGetUploadFile function in /cgi-bin/UploadCfg. The boundary parameter in the file upload functionality can be manipulated to overflow a stack buffer, potentially allowing remote attackers to execute arbitrary code.
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= 16.03.34.06CVSS 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 router modelAccess the router's web interface or check the device label to confirm it is a Tenda AC8 routerAffected if The device is not a Tenda AC8 model
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Check the installed firmware versionLog into the router web interface (typically at 192.168.0.1) and navigate to System Settings > Firmware Update, or use the command 'cat /proc/version' via telnet/SSH if available, to determine the exact firmware versionAffected if The firmware version is exactly 16.03.34.06
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Verify the Httpd service is runningAccess the router via telnet/SSH (if enabled) and run 'ps | grep httpd' to confirm the Httpd web server process is activeAffected if The Httpd service is running and the firmware is version 16.03.34.06
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Confirm the UploadCfg CGI endpoint existsAttempt to access the URL 'http://<router_ip>/cgi-bin/UploadCfg' via HTTP request to verify the endpoint is present on the deviceAffected if The /cgi-bin/UploadCfg endpoint responds and the firmware is version 16.03.34.06
The environment is affected if the device is a Tenda AC8 router running firmware version 16.03.34.06 with the Httpd service active and the /cgi-bin/UploadCfg endpoint 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 dataApply vendor firmware updates when available; until then, restrict external access to the router's web interface and disable the file upload CGI functionality if not required.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-3044 — 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-2026-3044 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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