CVE-2024-43391Network attack vector

Firewall reconfiguration via injected source-address value

Published Sep 10, 2024 · Updated Aug 22, 2025

Code injection in Phoenix Contact mGuard firmware before 8.9.3 or 10.4.1 allows remote authenticated users to reconfigure firewall services. The firmware uses the FW_PORTFORWARDING.SRC_IP environment value when generating firewall configuration without neutralizing attacker-controlled input. Low-privileged access is sufficient to alter packet filters, forwarding, access control, or NAT, causing a service interruption.

CVSS severity8.1
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Phoenix Contact mGuard firmware before 8.9.3 or 10.4.1 allows remote authenticated users to reconfigure firewall services. The firmware uses the FW_PORTFORWARDING.SRC_IP environment value when generating firewall configuration without neutralizing attacker-controlled input. Low-privileged access is sufficient to alter packet filters, forwarding, access control, or NAT, causing a service interruption.

The record

CVE
CVE-2024-43391
Published
Sep 10, 2024
Updated
Aug 22, 2025
Vendor
Phoenix Contact
Product
FL MGUARD RS2000 TX/TX-B
Classifications
CWE-94, T1562.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <8.9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Phoenix Contact · FL MGUARD RS2000 TX/TX-Bversion=0 <8.9.3
Phoenix Contact · FL MGUARD RS2005 TX VPNversion=0 <8.9.3
Phoenix Contact · TC MGUARD RS4000 4G VZW VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD 2105version=0 <10.4.1
Phoenix Contact · TC MGUARD RS2000 4G ATT VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD SMART2version=0 <8.9.3
Phoenix Contact · FL MGUARD RS4000 TX/TX-Mversion=0 <8.9.3
Phoenix Contact · FL MGUARD 4102 PCIEversion=0 <10.4.1
Phoenix Contact · FL MGUARD RS4004 TX/DTXversion=0 <8.9.3
Phoenix Contact · FL MGUARD PCIE4000version=0 <8.9.3
Phoenix Contact · FL MGUARD RS4000 TX/TX-Pversion=0 <8.9.3
Phoenix Contact · FL MGUARD PCIE4000 VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD 4302version=0 <10.4.1
Phoenix Contact · FL MGUARD RS4004 TX/DTX VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD SMART2 VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD CORE TXversion=0 <8.9.3
Phoenix Contact · FL MGUARD CORE TX VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD 4102 PCIversion=0 <10.4.1
Phoenix Contact · FL MGUARD RS4000 TX/TX VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD CENTERPORT VPN-1000version=0 <8.9.3
Phoenix Contact · FL MGUARD DELTA TX/TXversion=0 <8.9.3
Phoenix Contact · FL MGUARD PCI4000version=0 <8.9.3
Phoenix Contact · FL MGUARD 2102version=0 <10.4.1
Phoenix Contact · FL MGUARD GT/GTversion=0 <8.9.3
Phoenix Contact · TC MGUARD RS4000 4G ATT VPNversion=0 <8.9.3
Phoenix Contact · TC MGUARD RS2000 4G VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD PCI4000 VPNversion=0 <8.9.3
Phoenix Contact · TC MGUARD RS4000 3G VPNversion=0 <8.9.3
Phoenix Contact · TC MGUARD RS4000 4G VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD 4305version=0 <10.4.1
Phoenix Contact · FL MGUARD RS4000 TX/TXversion=0 <8.9.3
Phoenix Contact · FL MGUARD GT/GT VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD RS2000 TX/TX VPNversion=0 <8.9.3
Phoenix Contact · TC MGUARD RS2000 3G VPNversion=0 <8.9.3
Phoenix Contact · TC MGUARD RS2000 4G VZW VPNversion=0 <8.9.3
Phoenix Contact · FL MGUARD DELTA TX/TX VPNversion=0 <8.9.3

Published CVSS scores

8.1CERT VDECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1562.004Impair Defenses: Disable or Modify System Firewall

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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