CVE-2025-4827
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, which was classified as critical, was found in TOTOLINK A702R, A3002R and A3002RU 3.0.0-B20230809.1615. Affected is an unknown function of the file /boafrm/formSaveConfig of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. It is possible to launch 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 · moderate confidenceBuffer overflow vulnerability in TOTOLINK A702R, A3002R, and A3002RU routers (firmware 3.0.0-B20230809.1615) in the HTTP POST request handler for /boafrm/formSaveConfig. The submit-url parameter is not properly validated before use, allowing an attacker to overflow a buffer and potentially execute arbitrary code remotely.
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= 3.0.0-b20230809.1615= 3.0.0-b20230809.1615= 3.0.0-b20230809.1615CVSS 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 router modelAccess the router admin web interface or check the device label. Look for the model number in the web UI (usually on the status/dashboard page) or on the physical device.Affected if The router model is TOTOLINK A702R, A3002R, or A3002RU.
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Check firmware versionIn the router web admin interface, navigate to System Status or Firmware Upgrade page to view the current firmware version. Alternatively, check via telnet/SSH if enabled, or examine the firmware file if dumped from the device.Affected if The firmware version is exactly 3.0.0-b20230809.1615.
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Verify web interface is accessibleAttempt to access the router web admin panel via HTTP (port 80) or HTTPS (port 443) from a client on the same network. Enter the router IP in a browser.Affected if The router login page loads at the LAN IP address.
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Test for vulnerable endpointSend a POST request to http://[router-ip]/boafrm/formSaveConfig with any payload (even empty) to the submit-url parameter. A responsive router will process or reject the request.Affected if The endpoint responds (rather than returning 404 or connection error), indicating the formSaveConfig handler exists on this firmware.
You are affected if your TOTOLINK router is an A702R, A3002R, or A3002RU running firmware version 3.0.0-b20230809.1615 with the web interface 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 update if available; if no update exists, restrict network access to the device's management interface via firewall or disable remote administration.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-4827 — 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-2025-4827 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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