CVE-2023-23444Network attack vector

Service interruption via unauthenticated UDP IP reconfiguration

Published May 12, 2023 · Updated Jun 1, 2026

Missing authentication in all firmware versions of SICK Flexi gateways allows remote attackers to disrupt access via broadcast UDP packets. The gateway IP-configuration interface accepts broadcast UDP packets without authentication and applies the requested network settings. Reachability requires access to the gateway's broadcast domain; changing its address can interrupt network availability.

CVSS severity7.5
High
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in all firmware versions of SICK Flexi gateways allows remote attackers to disrupt access via broadcast UDP packets. The gateway IP-configuration interface accepts broadcast UDP packets without authentication and applies the requested network settings. Reachability requires access to the gateway's broadcast domain; changing its address can interrupt network availability.

The record

CVE
CVE-2023-23444
Published
May 12, 2023
Updated
Jun 1, 2026
Vendor
SICK AG
Product
UE410-EN3 Flexi Ethernet Gateway
Classifications
CWE-306, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=all firmware versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SICK AG · UE410-EN3 Flexi Ethernet Gatewayversion=all firmware versions
SICK AG · FX0-GPNT00030 Flexi Soft PROFINET Gateway Firmwareversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GENT00030version=all firmware versions
SICK AG · SICK Flexi Soft FX0-GMOD00000version=all firmware versions
SICK AG · SICK Flexi Soft FX0-GPNT00000version=all firmware versions
SICK AG · UE410-EN1 Flexi Ethernet Gatewayversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GENT00010version=all firmware versions
SICK AG · FX3-GEPR00010 Flexi Soft EFI-pro Gateway Firmwareversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GETC00000version=all firmware versions
SICK AG · FX3-GEPR00010 Flexi Soft EFI-pro Gatewayversion=all firmware versions
SICK AG · FX3-GEPR00000 Flexi Soft EFI-pro Gatewayversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GENT00000version=all firmware versions
SICK AG · FX3-GEPR00000 Flexi Soft EFI-pro Gateway Firmwareversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GPNT00010version=all firmware versions
SICK AG · FX0-GPNT00030 Flexi Soft PROFINET Gatewayversion=all firmware versions
SICK AG · UE410-EN3 Flexi Ethernet Gateway Firmwareversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GMOD00010version=all firmware versions
SICK AG · UE410-EN1 Flexi Ethernet Gateway Firmwareversion=all firmware versions
SICK AG · UE410-EN4 Flexi Ethernet Gateway Firmwareversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GETC00040version=all firmware versions
SICK AG · UE410-EN4 Flexi Ethernet Gatewayversion=all firmware versions
SICK AG · SICK Flexi Soft FX0-GETC00010version=all firmware versions

Published CVSS scores

7.5SICK AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T0814Denial of Service

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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