CVE-2024-43392
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 · uneditedA low privileged remote attacker can perform configuration changes of the firewall services, including packet filter, packet forwarding, network access control or NAT through the FW_INCOMING.FROM_IP FW_INCOMING.IN_IP FW_OUTGOING.FROM_IP FW_OUTGOING.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 confidenceA low-privilege remote attacker can manipulate firewall configuration through environment variables (FW_INCOMING.FROM_IP, FW_INCOMING.IN_IP, FW_OUTGOING.FROM_IP, FW_OUTGOING.IN_IP) to change packet filter, forwarding, NAT, or access control settings, causing denial of service.
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< 8.9.3< 8.9.3< 8.9.3< 8.9.3< 8.9.3< 8.9.3< 8.9.3< 8.9.3CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify the mGuard device modelAccess the device web interface or CLI and retrieve the model name (RS4000 or RS2000 series with 4G/3G variants)Affected if The device is a TC Mguard RS4000 or RS2000 series unit
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Check the installed firmware versionNavigate to the device web interface System > Firmware or use CLI command 'show version' to retrieve the current firmware versionAffected if The firmware version is lower than 8.9.3 (e.g., 8.9.2, 8.8.x, etc.)
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Inspect environment variables used for firewall configurationCheck the device configuration for the presence of environment variables: FW_INCOMING.FROM_IP, FW_INCOMING.IN_IP, FW_OUTGOING.FROM_IP, FW_OUTGOING.IN_IP. These may appear in config files, scripts, or the running configuration.Affected if Any of these environment variables are defined and active in the firewall configuration
You are affected if you have an RS4000 or RS2000 mGuard device running firmware version below 8.9.3 AND the device uses environment variable-based firewall configuration (FW_INCOMING/FW_OUTGOING variables are present in the configuration).
Generated from the published advisory. Verify against your own configuration.
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 · scoped8.9.3
Remove environment variable-based firewall configuration and implement proper authentication, authorization, and input validation for all firewall management functions.
Tc Mguard VPN Firmware >= 8.9.3 (all affected models: RS4000 and RS2000 variants)
- 1. Backup current device configuration
- 2. Download firmware version 8.9.3 or later from the vendor's official support portal (cert.vde.com references vendor)
- 3. Access the Mguard device management interface
- 4. Navigate to Firmware Update or System Maintenance section
- 5. Upload and apply the new firmware version 8.9.3
- 6. Verify the upgrade was successful by checking the firmware version in the device status
- 7. Restore configuration if needed and verify firewall services are operational
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-43392 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-43392 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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