CVE-2019-20766
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 · uneditedNETGEAR R7800 devices before 1.0.2.52 are affected by a stack-based buffer overflow by an authenticated user.
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 confidenceNETGEAR R7800 routers before firmware version 1.0.2.52 contain a stack-based buffer overflow vulnerability that allows authenticated users to potentially execute arbitrary code by overflowing a stack-allocated buffer through crafted input.
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< 1.0.2.52CVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:H/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 NETGEAR R7800Access the router admin interface (typically at 192.168.1.1) and check the Device Info or Status page to verify the exact model number displayedAffected if The device is not a NETGEAR R7800, then this specific CVE does not apply
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Check installed firmware versionIn the router admin interface, navigate to Administration > Firmware Update or Advanced > Administration > Router Update to view the current firmware version installedAffected if The firmware version is less than 1.0.2.52 (for example, 1.0.2.48, 1.0.2.50, etc.)
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Verify firmware version via command line (alternative)Access the router via telnet or SSH if enabled, then run the command 'nvram get fw_version' or check /proc/version to retrieve the firmware versionAffected if The displayed version is below 1.0.2.52
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Assess administrative access exposureCheck if remote management (Web Management Access) is enabled under Advanced > Administration > Remote Management. Also verify if the router admin interface is accessible from WAN (Internet) portsAffected if Remote administrative access is enabled and exposed to untrusted networks, increasing the likelihood of exploitation
The environment is affected if the device is a NETGEAR R7800 running firmware version lower than 1.0.2.52, particularly if the admin interface is accessible to untrusted users.
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 data1.0.2.52
Upgrade NETGEAR R7800 firmware to version 1.0.2.52 or later; if immediate patching is not possible, restrict administrative access to trusted users only to reduce the attack surface.
- Consultation3.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2019-20766 — 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-2019-20766 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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