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Tc Mguard Rs4000 4g Vzw Vpn FirmwareOperating system · Phoenixcontact

CVE-2024-43390

HIGH · 8.1 CVSS v3.1 Published 2024-09-10
Fix available
A fix is available. Upgrade to 8.9.3 or later.
See remediation →
87/100
Remediation priority · High
Remotely reachable 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
A low privileged remote attacker can perform configuration changes of the firewall services, including packet forwarding or NAT through the FW_NAT.IN_IP environment variable which can lead to a DoS.

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

A low-privileged remote attacker can manipulate firewall configuration through the FW_NAT.IN_IP environment variable to modify packet forwarding or NAT settings, causing denial of service. The vulnerability stems from improper handling of environment variables in firewall service configuration.

MitigationRestrict privileges for users managing firewall services, implement strict input validation on environment variables, and disable or sandbox environment variable processing for firewall configuration to prevent unauthorized modifications.

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
Tc Mguard Rs4000 4g Vzw Vpn FirmwareOperating system
Affected:< 8.9.3
Tc Mguard Rs4000 4g Vpn FirmwareOperating system
Affected:< 8.9.3
Tc Mguard Rs4000 4g Att Vpn FirmwareOperating system
Affected:< 8.9.3
Tc Mguard Rs4000 3g Vpn FirmwareOperating system
Affected:< 8.9.3
Tc Mguard Rs2000 4g Vzw Vpn FirmwareOperating system
Affected:< 8.9.3
Tc Mguard Rs2000 4g Vpn FirmwareOperating system
Affected:< 8.9.3
Tc Mguard Rs2000 4g Att Vpn FirmwareOperating system
Affected:< 8.9.3
Tc Mguard Rs2000 3g Vpn FirmwareOperating system
Affected:< 8.9.3

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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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 device model and firmware version
    Access the MGuard web interface or CLI and navigate to System > Firmware or use the 'show version' command in the console. Alternatively, check the firmware file name if you have access to the firmware update package.
    Affected if The device is a TC MGuard RS2000 or RS4000 series (any variant: 4G VZW, 4G, 4G ATT, 3G) and the firmware version is below 8.9.3
  2. Verify if the firewall NAT service is active
    Access the MGuard CLI or web interface and check the firewall/NAT service status. In CLI, use 'show firewall' or 'show nat' commands depending on available options.
    Affected if The firewall service with NAT functionality is enabled and processing the FW_NAT.IN_IP environment variable
  3. Inspect for unexpected firewall or NAT rule modifications
    Review current NAT and packet forwarding rules through the MGuard web interface under Firewall > NAT or via CLI commands like 'show ip nat translations' or equivalent. Compare against known-good baseline configurations.
    Affected if Unexpected NAT rules exist, particularly rules using environment variable-derived IP addresses that were not explicitly configured by an administrator

A user is affected if they are running a TC MGuard RS2000 or RS4000 series device with firmware version below 8.9.3 and the firewall NAT service is processing the FW_NAT.IN_IP environment variable.

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 8.9.3 or later
Fixed in 8.9.3
Interim mitigation

Restrict privileges for users managing firewall services, implement strict input validation on environment variables, and disable or sandbox environment variable processing for firewall configuration to prevent unauthorized modifications.

Recommended fix Moderate confidence

Firmware version 8.9.3 or later for TC Mguard RS2000/RS4000 series (all carrier variants)

  1. 1. Identify the specific TC Mguard model (RS2000 or RS4000) and carrier variant (VZW, ATT, 3G, or 4G) in use
  2. 2. Download the firmware version 8.9.3 or later from the official Tc Mguard vendor support portal or cert.vde.com reference
  3. 3. Access the device management interface through a secure, trusted network connection
  4. 4. Navigate to the firmware upgrade section in the device administration panel
  5. 5. Upload and apply the firmware version 8.9.3 or later
  6. 6. Verify the upgrade was successful by confirming the new firmware version in the device status
  7. 7. After upgrade, validate that firewall services, NAT, and packet forwarding configurations function correctly
Caveat Review vendor release notes for 8.9.3 to check for any configuration or feature changes that may require adjustments to existing firewall rules or NAT configurations

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

Fix this in Tc Mguard Rs4000 4g Vzw Vpn Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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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-2024-43390 in production — separate from our analysis above.

No notes yet

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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