CVE-2025-4440
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 was found in H3C GR-1800AX up to 100R008 and classified as critical. Affected by this issue is the function EnableIpv6 of the file /goform/aspForm. The manipulation of the argument param leads to buffer overflow. Access to the local network is required for this attack to succeed. 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 the EnableIpv6 function of the H3C GR-1800AX router's /goform/aspForm web interface. The param argument is not properly bounds-checked, allowing a local network attacker to overflow a buffer and potentially execute arbitrary code.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- Adjacent
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/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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Confirm device model is H3C GR-1800AXAccess the router's web administration interface or check the device label/menu to verify the exact model number matches GR-1800AXAffected if Device model is H3C GR-1800AX and the specific firmware version is unpatched (compare against vendor advisories)
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Check if IPv6 functionality is enabled on the routerLog into the router web interface and navigate to IPv6 or network settings to verify whether IPv6 is turned ON or enabledAffected if IPv6 is enabled on the router - the EnableIpv6 function with the vulnerable param argument must be accessible for exploitation
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Verify the web interface endpoint /goform/aspForm is reachableFrom a local network host, attempt to access http://<router-ip>/goform/aspForm or check if this URL responds (even with an error)Affected if The /goform/aspForm endpoint is accessible from the network - this is the interface containing the vulnerable EnableIpv6 function
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Check firmware version against available patchesIn the router web interface, look for a firmware version, hardware version, or system information section and record the version numberAffected if Firmware version has not been updated to include the CVE-2025-4440 patch (compare your version against H3C's official firmware release notes for this model)
You are affected if you have an H3C GR-1800AX router with IPv6 enabled, the web interface accessible on the network, and a firmware version that predates the vendor patch for this buffer overflow in the EnableIpv6 function.
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 patch exists, restrict network access to the router's management interface to trusted devices only, or disable IPv6 functionality if not required.
- 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-2025-4440 — 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-2025-4440 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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