CVE-2025-8980
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 G1 16.01.7.8(3660). Affected by this issue is the function check_upload_file of the component Firmware Update Handler. The manipulation leads to insufficient verification of data authenticity. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. 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 · moderate confidenceThe Tenda G1 router firmware 16.01.7.8 contains a vulnerability in the check_upload_file function within the Firmware Update Handler. This function performs insufficient verification of data authenticity when processing firmware uploads, potentially allowing attackers to upload malicious or modified firmware. The attack is remote but requires significant effort to exploit.
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= 16.01.7.8\(3660\)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
- High
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:H/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 interface or check the device label to confirm it is a Tenda G1 router. Use the command 'cat /proc/cpuinfo' or check the admin panel for device information.Affected if The device is not a Tenda G1 router, then it is not affected by this CVE.
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Check the installed firmware versionLog into the Tenda G1 router admin panel and navigate to System Status or Firmware Version. Alternatively, use 'cat /etc/version' or 'cat /proc/version' via telnet/SSH if available.Affected if The firmware version is exactly 16.01.7.8 (3660), then this specific CVE applies. If the version differs, the device is not affected by this specific vulnerability.
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Verify firmware update interface accessibilityAttempt to access the firmware upload page via the router's web interface (commonly at /upgrade.html, /firmware.htm, or similar). Check if the endpoint responds to requests.Affected if The firmware update page is accessible without authentication or with default credentials, making the vulnerable check_upload_file function reachable.
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Confirm if remote management is enabledCheck the router's administration settings for 'Remote Management', 'Web Access', or 'Firmware Upgrade via WAN' options. Look for settings that allow firmware updates from external sources.Affected if Remote firmware updates are enabled, the vulnerability can be exploited remotely rather than only from the local network.
A Tenda G1 router running firmware version 16.01.7.8 (3660) with an accessible firmware update interface is affected by this vulnerability.
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 network access to the firmware update interface, implement strong authentication for firmware upload operations, and contact Tenda for an official patch. If no patch is available, consider network segmentation to limit exposure to this device.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
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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-2025-8980 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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