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D7800 FirmwareOperating system · Netgear

CVE-2021-38529

CRITICAL · 9.8 CVSS v3.1 Published 2021-08-11
Fix available
A fix is available. Upgrade to 1.0.1.56 / 1.0.2.68 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges 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 command injection by an unauthenticated attacker. This affects D7800 before 1.0.1.56, R7800 before 1.0.2.68, R8900 before 1.0.4.26, and R9000 before 1.0.4.26.

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

Multiple NETGEAR router models (D7800, R7800, R8900, R9000) contain an unauthenticated command injection vulnerability allowing remote attackers to execute arbitrary operating system commands via specially crafted input to the web interface.

MitigationUpdate firmware to patched versions (D7800: 1.0.1.56, R7800: 1.0.2.68, R8900/R9000: 1.0.4.26). If patching is not possible, restrict network access to router management interfaces.

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
D7800 FirmwareOperating system
Affected:< 1.0.1.56
R7800 FirmwareOperating system
Affected:< 1.0.2.68
R8900 FirmwareOperating system
Affected:< 1.0.4.26
R9000 FirmwareOperating system
Affected:< 1.0.4.26

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
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 checks

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

  1. Identify router model
    Log into the router web interface and check the device information page, or look at the physical device label to confirm the exact model number (D7800, R7800, R8900, or R9000)
    Affected if Model is D7800, R7800, R8900, or R9000
  2. Check firmware version
    Access the router web interface, navigate to Administration > Firmware Update or Advanced > Administration > Router Update, and record the currently installed firmware version
    Affected if Firmware version is below 1.0.1.56 for D7800, below 1.0.2.68 for R7800, or below 1.0.4.26 for R8900/R9000
  3. Verify web interface accessibility
    Confirm the router web interface (HTTP/HTTPS on ports 80/443 or custom management ports) is reachable from the network. Attempt to access the login page from a remote client.
    Affected if The web management interface is accessible from untrusted networks (such as the internet or guest networks)
  4. Check remote management setting
    In the router web interface, go to Advanced > Administration > Remote Management and determine if remote management is enabled, which allows access from outside the local network
    Affected if Remote management is enabled and the router is accessible from the internet

A user is affected if they own a D7800, R7800, R8900, or R9000 device running firmware below the patched version with the web interface exposed to untrusted networks.

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.

dbcve · scoped
Upgrade available Upgrade to 1.0.1.56 / 1.0.2.68 / 1.0.4.26 or later
Fixed in 1.0.1.561.0.2.681.0.4.26
Interim mitigation

Update firmware to patched versions (D7800: 1.0.1.56, R7800: 1.0.2.68, R8900/R9000: 1.0.4.26). If patching is not possible, restrict network access to router management interfaces.

Recommended fix High confidence

D7800: 1.0.1.56 | R7800: 1.0.2.68 | R8900: 1.0.4.26 | R9000: 1.0.4.26

  1. 1. Identify your NETGEAR router model (D7800, R7800, R8900, or R9000).
  2. 2. Visit the NETGEAR support website (kb.netgear.com) or downloadcenter.netgear.com.
  3. 3. Enter your router model in the search or support page.
  4. 4. Download the firmware version 1.0.1.56 (for D7800), 1.0.2.68 (for R7800), or 1.0.4.26 (for R8900/R9000) or later.
  5. 5. Access your router's web management interface by navigating to routerlogin.net or 192.168.1.1.
  6. 6. Navigate to the Administration > Firmware Update section.
  7. 7. Select the downloaded firmware file and initiate the update.
  8. 8. Wait for the router to complete the update and reboot - do not power off the device during this process.
Caveat Firmware updates may reset router configuration to defaults; back up current settings before upgrading if needed

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in D7800 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,800
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,880.

Scan for this in your stack

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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-2021-38529 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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data