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CVE-2024-43390· NVD / CVE Program· CNA CERTVDE

Phoenix Contact: Firewall reconfiguration due to improper input validation in MGUARD devices

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.

HighCVSS 8.1 · v3.1—No exploit Fix available
Published
Sep 10, 2024
Updated
Jun 17, 2026
EPSS
0.5% · 42th percentile
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Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · CERTVDE
8.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
phoenixcontacttc mguard rs4000 4g vzw vpn firmware
phoenixcontacttc mguard rs4000 4g vzw vpn
phoenixcontacttc mguard rs4000 4g vpn firmware
phoenixcontacttc mguard rs4000 4g vpn
phoenixcontacttc mguard rs4000 4g att vpn firmware
phoenixcontacttc mguard rs4000 4g att vpn
phoenixcontacttc mguard rs4000 3g vpn firmware
phoenixcontacttc mguard rs4000 3g vpn
phoenixcontacttc mguard rs2000 4g vzw vpn firmware
phoenixcontacttc mguard rs2000 4g vzw vpn
phoenixcontacttc mguard rs2000 4g vpn firmware
phoenixcontacttc mguard rs2000 4g vpn

and 60 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • phoenixcontact fl mguard 2102 firmwarebefore 10.4.1
  • phoenixcontact fl mguard 2105 firmwarebefore 10.4.1
  • phoenixcontact fl mguard 4102 pci firmwarebefore 10.4.1
  • phoenixcontact fl mguard 4102 pcie firmwarebefore 10.4.1
  • phoenixcontact fl mguard 4302 firmwarebefore 10.4.1
  • phoenixcontact fl mguard 4305 firmwarebefore 10.4.1
  • phoenixcontact fl mguard centerport vpn-1000 firmwarebefore 8.9.3
  • phoenixcontact fl mguard core tx firmwarebefore 8.9.3
  • phoenixcontact fl mguard core tx vpn firmwarebefore 8.9.3
  • phoenixcontact fl mguard delta tx/tx firmwarebefore 8.9.3
  • phoenixcontact fl mguard delta tx/tx vpn firmwarebefore 8.9.3
  • phoenixcontact fl mguard gt/gt firmwarebefore 8.9.3
  • phoenixcontact fl mguard gt/gt vpn firmwarebefore 8.9.3
  • phoenixcontact fl mguard pci4000 firmwarebefore 8.9.3
  • phoenixcontact fl mguard pci4000 vpn firmwarebefore 8.9.3
  • phoenixcontact fl mguard pcie4000 firmwarebefore 8.9.3
  • phoenixcontact fl mguard pcie4000 vpn firmwarebefore 8.9.3
  • phoenixcontact fl mguard rs2000 tx/tx vpn firmwarebefore 8.9.3
  • phoenixcontact fl mguard rs2000 tx/tx-b firmwarebefore 8.9.3
  • phoenixcontact fl mguard rs2005 tx vpn firmwarebefore 8.9.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (CERTVDE). Independent of NVD's CPE analysis and usually ahead of it.

  • PHOENIX CONTACT FL MGUARD 2102

    • before 10.4.1affected · semver

  • PHOENIX CONTACT FL MGUARD 2105

    • before 10.4.1affected · semver

  • PHOENIX CONTACT FL MGUARD 4102 PCI

    • before 10.4.1affected · semver

  • PHOENIX CONTACT FL MGUARD 4102 PCIE

    • before 10.4.1affected · semver

  • PHOENIX CONTACT FL MGUARD 4302

    • before 10.4.1affected · semver

  • PHOENIX CONTACT FL MGUARD 4305

    • before 10.4.1affected · semver

  • PHOENIX CONTACT FL MGUARD CENTERPORT VPN-1000

    • before 8.9.3affected · semver

  • PHOENIX CONTACT FL MGUARD CORE TX

    • before 8.9.3affected · semver

  • PHOENIX CONTACT FL MGUARD CORE TX VPN

    • before 8.9.3affected · semver

  • PHOENIX CONTACT FL MGUARD DELTA TX/TX

    • before 8.9.3affected · semver

  • PHOENIX CONTACT FL MGUARD DELTA TX/TX VPN

    • before 8.9.3affected · semver

  • PHOENIX CONTACT FL MGUARD GT/GT

    • before 8.9.3affected · semver

Same product

phoenixcontact: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-12523Phoenix Contact mGuard Devices versions before 8.8.3: LAN ports get functional after reboot even if they are disabled in the device configuration
    36Monitor
  • CVE-2024-7699Phoenix Contact: OS command execution in MGUARD products
    35Monitor
  • CVE-2024-43388Phoenix Contact: SNMP reconfiguration due to improper input validation in MGUARD devices
    35Monitor
  • CVE-2024-43387Phoenix Contact: Access files due to improper neutralization of special elements in MGUARD devices
    35Monitor
  • CVE-2024-43386Phoenix Contact: OS command execution through EMAIL_NOTIFICATION.TO in mGuard devices.
    35Monitor
  • CVE-2024-43385Phoenix Contact: OS command execution through PROXY_HTTP_PORT in mGuard devices
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
PHOENIX CONTACT FL MGUARD 210210.4.1Vendor (CNA)
PHOENIX CONTACT FL MGUARD 210510.4.1Vendor (CNA)
PHOENIX CONTACT FL MGUARD 4102 PCI10.4.1Vendor (CNA)
PHOENIX CONTACT FL MGUARD 4102 PCIE10.4.1Vendor (CNA)
PHOENIX CONTACT FL MGUARD 430210.4.1Vendor (CNA)
PHOENIX CONTACT FL MGUARD 430510.4.1Vendor (CNA)
PHOENIX CONTACT FL MGUARD CENTERPORT VPN-10008.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD CORE TX8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD CORE TX VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD DELTA TX/TX8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD DELTA TX/TX VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD GT/GT8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD GT/GT VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD PCI40008.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD PCI4000 VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD PCIE40008.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD PCIE4000 VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS2000 TX/TX VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS2000 TX/TX-B8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS2005 TX VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS4000 TX/TX8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS4000 TX/TX VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS4000 TX/TX-M8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS4000 TX/TX-P8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS4004 TX/DTX8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD RS4004 TX/DTX VPN8.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD SMART28.9.3Vendor (CNA)
PHOENIX CONTACT FL MGUARD SMART2 VPN8.9.3Vendor (CNA)
PHOENIX CONTACT TC MGUARD RS2000 3G VPN8.9.3Vendor (CNA)
PHOENIX CONTACT TC MGUARD RS2000 4G ATT VPN8.9.3Vendor (CNA)

+6

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-433880 days apartPhoenix Contact: SNMP reconfiguration due to improper input validation in MGUARD devices
    35Monitor
  • CVE-2024-433890 days apartPhoenix Contact: OSPF reconfiguration due to improper input validation in MGUARD devices
    32Monitor
  • CVE-2024-433910 days apartPhoenix Contact: Firewall reconfiguration through the FW_PORTFORWARDING.SRC_IP in MGUARD devices
    32Monitor
  • CVE-2024-433920 days apartPhoenix Contact: Firewall reconfiguration through the FW_environment variables in MGUARD devices
    32Monitor
  • CVE-2024-433930 days apartPhoenix Contact: Configuration changes of the firewall services can lead to DoS in MGUARD devices
    32Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-94 · Improper Control of Generation of Code ('Code Injection')

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records