HOMEVULNERABILITIESCVE-2023-23451
CRITICAL

CVE-2023-23451

CWE-477Published: April 19, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The Flexi Classic and Flexi Soft Gateways SICK UE410-EN3 FLEXI ETHERNET GATEW. with serial number <=2311xxxx all Firmware versions, SICK UE410-EN1 FLEXI ETHERNET GATEW. with serial number <=2311xxxx all Firmware versions, SICK UE410-EN3S04 FLEXI ETHERNET GATEW. with serial number <=2311xxxx all Firmware versions, SICK UE410-EN4 FLEXI ETHERNET GATEW. with serial number <=2311xxxx all Firmware versions, SICK FX0-GENT00000 FLEXISOFT EIP GATEW. with serial number <=2311xxxx with Firmware <=V2.11.0, SICK FX0-GMOD00000 FLEXISOFT MOD GATEW. with serial number <=2311xxxx with Firmware <=V2.11.0, SICK FX0-GPNT00000 FLEXISOFT PNET GATEW. with serial number <=2311xxxx with Firmware <=V2.12.0, SICK FX0-GENT00030 FLEXISOFT EIP GATEW.V2 with serial number <=2311xxxx all Firmware versions, SICK FX0-GPNT00030 FLEXISOFT PNET GATEW.V2 with serial number <=2311xxxx all Firmware versions and SICK FX0-GMOD00010 FLEXISOFT MOD GW with serial number <=2311xxxx with Firmware <=V2.11.0 all have Telnet enabled by factory default. No password is set in the default configuration.

NVD Source

Technical Analysis

CVE-2023-23451 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

sick20 product(s)
ue410-en3 firmwareue410-en3ue410-en1 firmwareue410-en1ue410-en3s04 firmwareue410-en3s04ue410-en4 firmwareue410-en4fx0-gent00000 firmwarefx0-gent00000fx0-gmod00000 firmwarefx0-gmod00000+8
Source: NVD CPE · 20 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://sick.com/psirt
ADVISORYhttps://sick.com/psirt

All References (2)

→
https://sick.com/psirtVendor Advisory
→
https://sick.com/psirtVendor Advisory

Quick Facts

CVE IDCVE-2023-23451
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-477
CISA KEVNo
Affected1 vendor(s)
PublishedApr 19, 2023

Related CVEs (CWE-477)

CVE-2025-49219
9.8
CVE-2025-49220
9.8
CVE-2025-49212
9.8
CVE-2025-49213
9.8
CVE-2025-49216
9.8
CVE-2025-49217
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-23451 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2023-23451·NVD