CVE-2024-43393
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 FW_RULESETS.FROM_IP FW_RULESETS.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-privileged remote attacker can manipulate firewall service configuration (packet filter, packet forwarding, NAC, NAT) through manipulation of specific environment variables (FW_INCOMING.FROM_IP, FW_INCOMING.IN_IP, FW_OUTGOING.FROM_IP, FW_OUTGOING.IN_IP, FW_RULESETS.FROM_IP, FW_RULESETS.IN_IP), leading to 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 device modelLocate the mGuard device label or check system information to confirm it is an RS4000 or RS2000 series model (RS4000 4G VZW, RS4000 4G, RS4000 4G ATT, RS4000 3G, RS2000 4G VZW, RS2000 4G, RS2000 4G ATT, or RS2000 3G)Affected if Device is not an RS4000 or RS2000 series model - not affected
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Check firmware versionAccess the mGuard web interface or CLI and locate the firmware version information, typically found under System > Status or via 'show version' commandAffected if Firmware version is 8.9.3 or higher - not affected; version is below 8.9.3 - potentially affected
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Verify remote access exposureCheck if the mGuard web interface or management interface is accessible from remote networks. Inspect network configuration to determine if HTTP/HTTPS management ports are exposed to untrusted networksAffected if Remote management interface is not exposed to untrusted networks - lower risk; interface is exposed to remote attackers - affected
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Check for environment variable manipulation attemptsReview system logs or audit logs for suspicious patterns involving environment variables FW_INCOMING.FROM_IP, FW_INCOMING.IN_IP, FW_OUTGOING.FROM_IP, FW_OUTGOING.IN_IP, FW_RULESETS.FROM_IP, or FW_RULESETS.IN_IP being set or modifiedAffected if No such environment variable manipulation in logs - not currently exploited; manipulation attempts observed - affected and possibly exploited
The environment is affected if the device is an mGuard RS2000 or RS4000 series model running firmware version below 8.9.3 and the management interface is exposed to remote or low-privileged users who can influence environment variables.
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
Implement strict input validation and sanitization for environment variables used in firewall configuration; consider removing environment variable-based firewall rules entirely or restricting low-privileged user access to firewall configuration interfaces.
Tc Mguard firmware version 8.9.3
- Identify the specific Tc Mguard model (RS4000 or RS2000, including variant such as 4G VZW, 4G ATT, or 3G) currently in use
- Access the device administration interface or console
- Backup the current device configuration before proceeding with firmware update
- Download firmware version 8.9.3 or later from the official vendor source (cert.vde.com or manufacturer's support portal)
- Upload the firmware file through the device's web interface or CLI using the standard firmware upgrade function
- Allow the device to complete the firmware update process without interruption
- After reboot, verify the device is running firmware version 8.9.3 or later
- Restore the previously backed up configuration if needed
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-43393 — 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-2024-43393 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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- Version or environment caveats, and links to real fixes
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