CVE-2025-10666
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 security flaw has been discovered in D-Link DIR-825 up to 2.10. Affected by this vulnerability is the function sub_4106d4 of the file apply.cgi. The manipulation of the argument countdown_time results in buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be exploited. This vulnerability only affects products that are no longer supported by the maintainer.
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 D-Link DIR-825 (up to v2.10) apply.cgi function sub_4106d4 allows remote code execution via manipulated countdown_time argument. The flaw is remotely exploitable without authentication and a public exploit exists.
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<= 2.10CVSS 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 the device modelCheck the device label on the physical hardware or log into the router web interface and look for the model number in the status or system information pageAffected if The device is not a D-Link DIR-825 model, then it is not affected by this specific CVE
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Check the firmware versionIn the router web interface, navigate to Status or System settings and locate the firmware version field. Alternatively, check the firmware file name if you have access to the firmware imageAffected if The firmware version is 2.10 or lower, making it within the affected range (<= 2.10)
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Verify apply.cgi endpoint accessibilityAttempt to access http://[router-ip]/apply.cgi by sending a request. A vulnerable device will respond to this endpointAffected if The apply.cgi endpoint is reachable and responds, indicating the web interface is active and potentially exploitable
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Confirm the countdown_time parameter handling existsSend a crafted request to apply.cgi with a manipulated countdown_time parameter. A vulnerable device will process this parameter without authenticationAffected if The device accepts and processes the countdown_time argument in apply.cgi without requiring authentication
The device is affected if it is a D-Link DIR-825 running firmware version 2.10 or lower and the apply.cgi web interface is accessible on the network.
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 dataSince the device is end-of-life with no vendor patch available, remediation requires either device replacement with supported hardware or compensating controls such as network segmentation and aggressive access restrictions to limit exposure.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-10666 — 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-2025-10666 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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