CVE-2023-2673

PHOENIX CONTACT: FL/TC MGUARD prone to Improper Input Validation

5.3 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.62%Up 0.6 points since Jun 13, 2023

What each source reports

CVE List Score used 5.3

PHOENIX CONTACT: FL/TC MGUARD prone to Improper Input Validation

Record: CVE-2023-2673
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-1287
Updated: 2026-11-02

EUVDEUVD-2023-34137 5.3

Record: EUVD-2023-34137
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-fw3q-vjp3-89w5 5.8

Improper Input Validation vulnerability in PHOENIX CONTACT FL/TC MGUARD Family in multiple...

Record: GHSA-fw3q-vjp3-89w5
CVSS 3.1: 5.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Weakness: CWE-20, CWE-1287
Updated: 2026-11-02

NVD 5.3

Record: CVE-2023-2673
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-1287
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-2673 is a medium vulnerability (CVSS 5.3) in Phoenix Contact Fl Mguard 2102, published June 13, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 50th percentile. No source names a fixed version.