# What is CVE-2023-2673?

> CVE-2023-2673 is a medium-severity flaw (CVSS 5.3) in Fl Mguard 2102 from Phoenixcontact, published on 13 June 2023. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.6%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2023-2673

## At a glance

- **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle.
- **Precursor Intelligence risk score:** 21 out of 100 (Low); action: Monitor. Kept up to date as the evidence changes.
- **Severity:** Medium (CVSS 5.3 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 0.6% (latest exploit-likelihood forecast)
- **Published:** 13 June 2023
- **Record last updated:** 2 October 2024
- **Main product:** Fl Mguard 2102 from Phoenixcontact
- **Affected products:** 52

## What is CVE-2023-2673? In plain terms

It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can slow it down.

### The official description

Improper Input Validation vulnerability in PHOENIX CONTACT FL/TC MGUARD Family in multiple versions may allow UDP packets to bypass the filter rules and access the solely connected device behind the MGUARD which can be used for flooding attacks.

### What kind of flaw is it?

- CWE-1287: Improper Validation of Specified Type of Input

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can slow it down

Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`

## Is CVE-2023-2673 being exploited? Not that we know of

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.6%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 0.6%, 0.6%, 0.6%, 0.6%, 0.6%, 0.6%, 0.6%.

### Timeline

- 13 June 2023: Published
- 2 October 2024: Record last updated

### How Precursor Intelligence ranks it

CVE-2023-2673 scores **21 out of 100 (Low)**, with the action "Monitor".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: key context
- Real threat activity around it: key context

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2023-2673?

The published record lists 52 products.

- [Fl Mguard 2102](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_2102) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard 2102 Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_2102_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 10.1.1
- [Fl Mguard 4102 Pci](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_4102_pci) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard 4102 Pci Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_4102_pci_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 10.1.1
- [Fl Mguard 4102 Pcie](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_4102_pcie) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard 4102 Pcie Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_4102_pcie_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 10.1.1
- [Fl Mguard 4302](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_4302) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard 4302 Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_4302_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 10.1.1
- [Fl Mguard Centerport](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_centerport) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Centerport Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_centerport_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Centerport VPN-1000](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_centerport_vpn-1000) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Centerport VPN-1000 Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_centerport_vpn-1000_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Core Tx](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_core_tx) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Core Tx Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_core_tx_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Core Tx VPN](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_core_tx_vpn) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Core Tx VPN Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_core_tx_vpn_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Delta Tx/tx by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Delta Tx/tx Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Delta Tx/tx VPN by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Delta Tx/tx VPN Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Gt/gt by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Gt/gt Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Gt/gt VPN by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Gt/gt VPN Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Pci4000](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pci4000) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Pci4000 Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pci4000_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Pci4000 VPN](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pci4000_vpn) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Pci4000 VPN Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pci4000_vpn_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Pcie4000](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pcie4000) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Pcie4000 Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pcie4000_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Pcie4000 VPN](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pcie4000_vpn) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Pcie4000 VPN Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_pcie4000_vpn_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Rs2000 Tx/tx VPN by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Rs2000 Tx/tx VPN Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Rs2000 Tx/tx-B by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Rs2000 Tx/tx-B Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Rs2005 Tx VPN](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_rs2005_tx_vpn) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Rs2005 Tx VPN Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_rs2005_tx_vpn_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Rs4000 Tx/tx VPN by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Rs4000 Tx/tx VPN Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Rs4000 Tx/tx-M by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Rs4000 Tx/tx-M Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Rs4000 Tx/tx-P by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Rs4000 Tx/tx-P Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Rs4004 Tx/dtx by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Rs4004 Tx/dtx Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- Fl Mguard Rs4004 Tx/dtx VPN by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- Fl Mguard Rs4004 Tx/dtx VPN Firmware by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Smart2](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_smart2) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Smart2 Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_smart2_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0
- [Fl Mguard Smart2 VPN](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_smart2_vpn) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Hardware): version not specified
- [Fl Mguard Smart2 VPN Firmware](https://www.precursorintelligence.com/product/phoenixcontact/fl_mguard_smart2_vpn_firmware) by [Phoenixcontact](https://www.precursorintelligence.com/vendors/phoenixcontact) (Operating system): up to 8.9.0

## How do I fix CVE-2023-2673?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

### References

- [cert.vde.com](https://cert.vde.com/en/advisories/VDE-2023-010/) (Mitigation, Third-party advisory)

## Questions

### What is CVE-2023-2673?

CVE-2023-2673 is a medium-severity flaw in Fl Mguard 2102 from Phoenixcontact, published on 13 June 2023. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can slow it down.

### How serious is CVE-2023-2673?

It scores 5.3 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2023-2673 is 21 out of 100, which is Low. Its action is "Monitor". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2023-2673 being exploited?

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.6%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2023-2673 affect?

For Fl Mguard 2102 from Phoenixcontact: version not specified. The record lists 52 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2023-2673?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2023-2673 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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