CVE-2018-25316
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 · uneditedTenda W308R v2 V5.07.48 contains a cookie session weakness vulnerability that allows unauthenticated attackers to modify DNS settings by exploiting insufficient session validation. Attackers can send GET requests to the goform/AdvSetDns endpoint with a crafted admin language cookie to change DNS servers and redirect user traffic to malicious sites.
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 confidenceThe Tenda W308R v2 router firmware V5.07.48 contains an authentication bypass vulnerability where insufficient session validation in the goform/AdvSetDns endpoint allows unauthenticated attackers to modify DNS settings via GET requests using a crafted admin language cookie, enabling traffic redirection to malicious sites.
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= 5.07.48CVSS 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 router modelAccess the router's web interface and navigate to the status or system information page to confirm the device is a Tenda W308R v2Affected if The device is not a Tenda W308R v2, then it is not affected by this specific CVE
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Check the firmware versionIn the router's web interface, look for firmware version information typically found under System Settings, Status, or Administration. Compare the installed version to 5.07.48Affected if The firmware version is exactly 5.07.48, the device falls within the affected range
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Verify the goform/AdvSetDns endpoint existsAttempt to access http://<router-ip>/goform/AdvSetDns via a GET request. A successful connection (even with an error response) indicates the endpoint is presentAffected if The endpoint returns any HTTP response, indicating it is enabled on the device
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Test for the authentication bypassSend a crafted GET request to the goform/AdvSetDns endpoint with a modified admin language cookie but without valid session credentials. If the request is processed (rather than rejected for authentication failure), the vulnerability is presentAffected if The request is processed without requiring authentication, confirming the bypass is present
The device is affected if it is a Tenda W308R v2 router running firmware version 5.07.48 with the goform/AdvSetDns endpoint accessible and vulnerable to unauthenticated cookie-based bypass.
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 the vendor firmware update to a patched version; if unavailable, restrict network access to the router's management interface or disable remote administration.
- Consultation1.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-25316 — 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-2018-25316 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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