CVE-2018-17777
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 · uneditedAn issue was discovered on D-Link DVA-5592 A1_WI_20180823 devices. If the PIN of the page "/ui/cbpc/login" is the default Parental Control PIN (0000), it is possible to bypass the login form by editing the path of the cookie "sid" generated by the page. The attacker will have access to the router control panel with administrator privileges.
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 confidenceD-Link DVA-5592 devices running A1_WI_20180823 firmware contain an authentication bypass vulnerability in the /ui/cbpc/login page. When the Parental Control PIN is set to the default value (0000), an attacker can modify the 'sid' cookie path to bypass the login form entirely and gain administrator-level access to the router's web control panel.
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= a1_wi_20180823CVSS 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 modelAccess the router web interface or check the device label to confirm the model is D-Link DVA-5592Affected if Device is not a D-Link DVA-5592 (other models are not affected by this specific CVE)
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Check the installed firmware versionLog into the router web interface and navigate to the firmware/version status page, or check via CLI using 'cat /proc/version' or 'version' command if SSH/telnet is enabledAffected if Firmware version is NOT equal to 'a1_wi_20180823' (only this exact version is affected)
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Verify Parental Control PIN configurationAccess the router web interface, go to Parental Controls settings, and examine the currently configured PIN valueAffected if Parental Control PIN is set to '0000' (the default value that enables the bypass)
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Confirm web interface accessibilityAttempt to access the /ui/cbpc/login page via HTTP/HTTPS on the router's LAN or WAN IP addressAffected if The /ui/cbpc/login endpoint is accessible and responds without requiring authentication
You are affected only if you have a DVA-5592 device running exactly firmware a1_wi_20180823 with Parental Control PIN still set to the default 0000.
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 dataChange the default Parental Control PIN from 0000 to a unique value and implement server-side validation of the session cookie to prevent path manipulation attacks.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-17777 — 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-2018-17777 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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