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Gc108p FirmwareOperating system · Netgear

CVE-2021-40867

HIGH · 7.1 CVSS v3.1 Published 2021-09-13
Fix available
A fix is available. Upgrade to 1.0.3.2 / 1.0.5.3 or later.
See remediation →
73/100
Remediation priority · Elevated
Public exploit 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 smart switches are affected by an authentication hijacking race-condition vulnerability by an unauthenticated attacker who uses the same source IP address as an admin in the process of logging in (e.g., behind the same NAT device, or already in possession of a foothold on an admin's machine). This occurs because the multi-step HTTP authentication process is effectively tied only to the source IP address. This affects GC108P before 1.0.8.2, GC108PP before 1.0.8.2, GS108Tv3 before 7.0.7.2, GS110TPP before 7.0.7.2, GS110TPv3 before 7.0.7.2, GS110TUP before 1.0.5.3, GS308T before 1.0.3.2, GS310TP before 1.0.3.2, GS710TUP before 1.0.5.3, GS716TP before 1.0.4.2, GS716TPP before 1.0.4.2, GS724TPP before 2.0.6.3, GS724TPv2 before 2.0.6.3, GS728TPPv2 before 6.0.8.2, GS728TPv2 before 6.0.8.2, GS750E before 1.0.1.10, GS752TPP before 6.0.8.2, GS752TPv2 before 6.0.8.2, MS510TXM before 1.0.4.2, and MS510TXUP before 1.0.4.2.

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

A detailed technical summary for this CVE is being prepared.

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
Gc108p FirmwareOperating system
Affected:< 1.0.8.2
Gc108pp FirmwareOperating system
Affected:< 1.0.8.2
Gs108t FirmwareOperating system
Affected:< 7.0.7.2
Gs110tpp FirmwareOperating system
Affected:< 7.0.7.2
Gs110tp FirmwareOperating system
Affected:< 7.0.7.2
Gs110tup FirmwareOperating system
Affected:< 1.0.5.3
Gs308t FirmwareOperating system
Affected:< 1.0.3.2
Gs310tp FirmwareOperating system
Affected:< 1.0.3.2

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
High
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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 1.0.3.2 / 1.0.5.3 / 1.0.8.2 or later
Fixed in 1.0.3.21.0.5.31.0.8.2
Recommended fix High confidence

Model-specific minimum firmware: GC108P/GC108PP to 1.0.8.2, GS108Tv3/GS110TPP/GS110TPv3 to 7.0.7.2, GS110TUP/GS710TUP to 1.0.5.3, GS308T/GS310TP to 1.0.3.2, GS716TP/GS716TPP to 1.0.4.2, GS724TPP/GS724TPv2 to 2.0.6.3, GS728TPPv2/GS728TPv2/GS752TPP/GS752TPv2 to 6.0.8.2, GS750E to 1.0.1.10, MS510TXM/MS

  1. 1. Identify the specific NETGEAR switch model from the affected list (GC108P, GC108PP, GS108Tv3, GS110TPP, GS110TPv3, GS110TUP, GS308T, GS310TP, GS710TUP, GS716TP, GS716TPP, GS724TPP, GS724TPv2, GS728TPPv2, GS728TPv2, GS750E, GS752TPP, GS752TPv2, MS510TXM, MS510TXUP)
  2. 2. Visit the NETGEAR support website (kb.netgear.com) and locate the firmware download page for your specific switch model
  3. 3. Download the latest firmware version that meets or exceeds the fixed version for your model
  4. 4. Access the switch's web management interface using an admin account
  5. 5. Navigate to the firmware upgrade section (typically under Maintenance > Firmware Upgrade)
  6. 6. Upload and apply the new firmware file
  7. 7. Wait for the switch to reboot and verify the new firmware version is installed
  8. 8. Confirm the authentication mechanism no longer relies solely on source IP address by testing multi-user scenarios
Caveat Firmware upgrades on network devices may cause temporary downtime; ensure backup of configuration and plan for maintenance window

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

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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

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