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D6220 FirmwareOperating system · Netgear

CVE-2019-20733

MEDIUM · 6.7 CVSS v3.1 Published 2020-04-16
Fix available
A fix is available. Upgrade to 1.0.0.44 / 1.0.0.51 or later.
See remediation →
69/100
Remediation priority · Elevated
Zero-click

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 · unedited
Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects D6220 before 1.0.0.44, D6400 before 1.0.0.78, D7000v2 before 1.0.0.51, D8500 before 1.0.3.42, DGN2200v4 before 1.0.0.110, DGND2200Bv4 before 1.0.0.110, EX3700 before 1.0.0.70, EX3800 before 1.0.0.70, EX6000 before 1.0.0.30, EX6100 before 1.0.2.24, EX6120 before 1.0.0.40, EX6130 before 1.0.0.22, EX6150v1 before 1.0.0.42, EX6200 before 1.0.3.88, EX7000 before 1.0.0.66, R6250 before 1.0.4.26, R6300v2 before 1.0.4.28, R6400 before 1.0.1.36, R6400v2 before 1.0.2.52, R6700 before 1.0.1.46, R6900 before 1.0.1.46, R7000 before 1.0.9.28, R6900P before 1.3.1.64, R7000P before 1.3.1.64, R7100LG before 1.0.0.46, R7300DST before 1.0.0.68, R7900 before 1.0.2.10, R8000 before 1.0.4.12, R7900P before 1.3.0.10, R8000P before 1.3.0.10, R8300 before 1.0.2.122, R8500 before 1.0.2.122, WN2500RPv2 before 1.0.1.54, WNDR3400v3 before 1.0.1.22, and WNR3500Lv2 before 1.2.0.54.

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 confidence

Stack-based buffer overflow in multiple NETGEAR router models (wireless extenders and routers) allows unauthenticated remote attackers to potentially execute arbitrary code via specially crafted network requests. The vulnerability affects the web management interface or network services running on these devices.

MitigationApply vendor firmware updates to the versions specified in the advisory for each affected model (e.g., R7000 to 1.0.9.28, EX7000 to 1.0.0.66). If patches are unavailable, restrict network access to management interfaces and disable remote administration.

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
D6220 FirmwareOperating system
Affected:< 1.0.0.44
D6400 FirmwareOperating system
Affected:< 1.0.0.78
D7000 FirmwareOperating system
Affected:< 1.0.0.51
D8500 FirmwareOperating system
Affected:< 1.0.3.42
Dgn2200 FirmwareOperating system
Affected:< 1.0.0.110
Dgnd2200b FirmwareOperating system
Affected:< 1.0.0.110
Ex3700 FirmwareOperating system
Affected:< 1.0.0.70
Ex3800 FirmwareOperating system
Affected:< 1.0.0.70

CVSS 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
Local
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the NETGEAR device model
    Access the router web management interface (typically at 192.168.1.1) and check the device information page, or look at the device label itself
    Affected if The device model is NOT one of: D6220, D6400, D7000, D8500, Dgn2200, Dgnd2200b, Ex3700, Ex3800 (unaffected models)
  2. Check the installed firmware version
    Log into the router web interface and navigate to Administration > Firmware Update or check the status/diagnostics page for the current firmware version number
    Affected if The firmware version is LOWER than the threshold for your model: D6220 < 1.0.0.44, D6400 < 1.0.0.78, D7000 < 1.0.0.51, D8500 < 1.0.3.42, Dgn2200 < 1.0.0.110, Dgnd2200b < 1.0.0.110, Ex3700 < 1.0.0.70, Ex3800 < 1.0.0.70
  3. Verify if the web management interface is network accessible
    Attempt to access the router web interface from a device on the local network (not from the router itself) using HTTP or HTTPS
    Affected if The web management interface is reachable from network devices (indicates the service is running and accessible)
  4. Check if remote administration is enabled
    In the router web interface, go to Advanced > Remote Management or Administration > Remote Management and verify if the 'Enable Remote Management' or similar option is checked
    Affected if Remote administration is enabled, allowing management interface access from outside the local network

You are affected if your NETGEAR device matches one of the listed models AND your firmware version is below the specified threshold AND the web management interface is network-accessible, particularly if remote administration is enabled.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to 1.0.0.44 / 1.0.0.51 / 1.0.0.70 or later
Fixed in 1.0.0.441.0.0.511.0.0.70
Interim mitigation

Apply vendor firmware updates to the versions specified in the advisory for each affected model (e.g., R7000 to 1.0.9.28, EX7000 to 1.0.0.66). If patches are unavailable, restrict network access to management interfaces and disable remote administration.

Fix this in D6220 Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-20733 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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