CVE-2019-20739
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 R8500 devices before v1.0.2.128 are affected by a buffer overflow by an unauthenticated attacker.
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 R8500 routers before firmware version 1.0.2.128 contain a buffer overflow vulnerability that allows unauthenticated remote attackers to execute arbitrary code or cause denial of service via malformed network input. The vulnerability results from insufficient bounds checking in firmware components that handle network requests.
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< 1.0.2.128CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/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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Confirm device model is NETGEAR R8500Access the router web interface or check the device label/marketing to verify the exact model numberAffected if Device is not a NETGEAR R8500 model
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Check installed firmware versionLog into the router web interface and navigate to Administration > Firmware Update or similar, or use the 'routerinfo' command via telnet/SSH if available, to view the current firmware versionAffected if Firmware version is lower than 1.0.2.128
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Verify network exposure of management interfaceCheck router network configuration to determine if the web management interface (HTTP/HTTPS on ports 80/443 or alternate management ports) is accessible from untrusted networks such as the internetAffected if Management interface is exposed to untrusted networks without authentication barriers
The device is affected if it is a NETGEAR R8500 running firmware version lower than 1.0.2.128 and the management interface is network-accessible to untrusted parties.
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 data1.0.2.128
Upgrade NETGEAR R8500 firmware to version 1.0.2.128 or later. If immediate upgrading is not feasible, restrict network access to the device's management interface to prevent unauthenticated exploitation.
- Consultation4.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2019-20739 — 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-2019-20739 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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