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Cbr750 FirmwareOperating system · Netgear

CVE-2021-45506

HIGH · 8.8 CVSS v3.1 Published 2021-12-26
Fix available
A fix is available. Upgrade to 3.2.17.12 / 4.6.3.6 or later.
See remediation →
93/100
Remediation priority · Urgent
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 authentication bypass. This affects CBR750 before 4.6.3.6, RBK752 before 3.2.17.12, RBR750 before 3.2.17.12, RBS750 before 3.2.17.12, RBK852 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12.

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 confidence

Authentication bypass vulnerability in NETGEAR Orbi mesh router systems (CBR750, RBK752, RBR750, RBS750, RBK852, RBR850, RBS850) allows unauthorized access to the device management interface. The vulnerability exists in firmware versions prior to 4.6.3.6 (CBR750) or 3.2.17.12 (other models), potentially allowing attackers to bypass authentication mechanisms and gain administrative access without valid credentials.

MitigationUpdate NETGEAR device firmware to version 4.6.3.6 or later for CBR750, and version 3.2.17.12 or later for RBK752/RBR750/RBS750/RBK852/RBR850/RBS850 models. Apply updates through the web management interface or NETGEAR Orbi app.

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
Cbr750 FirmwareOperating system
Affected:< 4.6.3.6
Rbk752 FirmwareOperating system
Affected:< 3.2.17.12
Rbr750 FirmwareOperating system
Affected:< 3.2.17.12
Rbs750 FirmwareOperating system
Affected:< 3.2.17.12
Rbk852 FirmwareOperating system
Affected:< 3.2.17.12
Rbr850 FirmwareOperating system
Affected:< 3.2.17.12
Rbs850 FirmwareOperating system
Affected:< 3.2.17.12

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
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 checks

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

  1. Identify the exact Orbi model number
    Locate the model label on the device or check the web management interface (typically at 192.168.1.1) under Administration > Firmware Version or similar status page
    Affected if Model is one of: CBR750, RBK752, RBR750, RBS750, RBK852, RBR850, or RBS850
  2. Check the installed firmware version
    Access the router web interface and navigate to Administration > Firmware Update or Advanced > Administration > Router Status to view the current firmware version
    Affected if Firmware version cannot be determined or is visible but below the thresholds in the next step
  3. Compare firmware version against vulnerable thresholds
    If model is CBR750, check if version is below 4.6.3.6. For RBK752, RBR750, RBS750, RBK852, RBR850, or RBS850, check if version is below 3.2.17.12
    Affected if CBR750 firmware is less than 4.6.3.6 OR any RBK752/RBR750/RBS750/RBK852/RBR850/RBS850 model is running firmware below 3.2.17.12
  4. Verify device is accessible on the network
    Confirm the Orbi router or satellite is reachable on the local network (ping the device IP or attempt to access the web interface)
    Affected if Device is network-accessible AND meets the version conditions above - the authentication bypass can then be attempted by an attacker on the same network

A user is affected if they own a CBR750 running firmware below 4.6.3.6, or any of RBK752/RBR750/RBS750/RBK852/RBR850/RBS850 running firmware below 3.2.17.12, and the device is accessible on their network.

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 3.2.17.12 / 4.6.3.6 or later
Fixed in 3.2.17.124.6.3.6
Interim mitigation

Update NETGEAR device firmware to version 4.6.3.6 or later for CBR750, and version 3.2.17.12 or later for RBK752/RBR750/RBS750/RBK852/RBR850/RBS850 models. Apply updates through the web management interface or NETGEAR Orbi app.

Recommended fix High confidence

CBR750: firmware >= 4.6.3.6 | RBK752/RBR750/RBS750/RBK852/RBR850/RBS850: firmware >= 3.2.17.12

  1. 1. Identify the exact NETGEAR device model from the affected list (CBR750, RBK752, RBR750, RBS750, RBK852, RBR850, or RBS850)
  2. 2. Access the NETGEAR device web interface or download the firmware from the official NETGEAR support site (kb.netgear.com)
  3. 3. Locate the firmware update section in the device settings or download the appropriate firmware file for your specific model
  4. 4. Upload and apply the firmware update to the device
  5. 5. After the update completes, verify the firmware version matches or exceeds the fixed release (CBR750: 4.6.3.6 or later; RBK752/RBR750/RBS750/RBK852/RBR850/RBS850: 3.2.17.12 or later)
  6. 6. Confirm the authentication bypass vulnerability is resolved by verifying admin access controls function properly

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

Fix this in Cbr750 Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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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-2021-45506 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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  • No spam, self-promotion, credentials, or personal data