# CVE-2023-23451: Hardcoded credentials in SICK FX0-GENT00000, SICK FX0-GENT00030, SICK FX0-GMOD00000, SICK FX0-GMOD00010, SICK FX0-GPNT00000, SICK FX0-GPNT00030, SICK UE410-EN1, SICK UE410-EN3, SICK UE410-EN3S04, SICK UE410-EN4

> Attackers can gain unauthorized access to SICK industrial gateways via Telnet because it is enabled by default without a password.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Apr 2023
- **Updated:** 5 Feb 2025
- **Also known as:** GHSA-j4pp-rp58-2qhj

## What is CVE-2023-23451?

CVE-2023-23451 is a critical vulnerability in SICK FX0-GENT00000, SICK FX0-GENT00030, SICK FX0-GMOD00000, SICK FX0-GMOD00010, SICK FX0-GPNT00000, SICK FX0-GPNT00030, SICK UE410-EN1, SICK UE410-EN3, SICK UE410-EN3S04, SICK UE410-EN4, published on 19 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-477 (Use of Obsolete Function)

## Which versions are affected by CVE-2023-23451?

It affects 10 products.


Products: Sick Fx0-Gent00000 Firmware, Sick Fx0-Gent00030 Firmware, Sick Fx0-Gmod00000 Firmware, Sick Fx0-Gmod00010 Firmware, Sick Fx0-Gpnt00000 Firmware, Sick Fx0-Gpnt00030 Firmware, Sick Ue410-En1 Firmware, Sick Ue410-En3 Firmware, Sick Ue410-En3s04 Firmware, Sick Ue410-En4 Firmware.

## How do I fix CVE-2023-23451?

No fix has been published for CVE-2023-23451 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-23451 being exploited?

There is no known exploitation of CVE-2023-23451 in the wild and no public exploit code.

## Other vulnerabilities in SICK FX0-GENT00000, SICK FX0-GENT00030, SICK FX0-GMOD00000, SICK FX0-GMOD00010, SICK FX0-GPNT00000, SICK FX0-GPNT00030, SICK UE410-EN1, SICK UE410-EN3, SICK UE410-EN3S04, SICK UE410-EN4

- [CVE-2023-23453](https://insights.sbomify.com/CVE-2023-23453/): Missing authorization in FX0-GENT v3 Firmware (critical 9.8)
- [CVE-2023-5246](https://insights.sbomify.com/CVE-2023-5246/): Auth bypass in FX0-GENT00000 (high 8.8)
- [CVE-2023-23444](https://insights.sbomify.com/CVE-2023-23444/): Missing authorization in FX0-GENT00000 FLEXISOFT EIP GATEW. (high 7.5)
- [CVE-2019-14753](https://insights.sbomify.com/CVE-2019-14753/): Memory corruption in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-23451 and fix it if it is affected.

What it is: CVE-2023-23451 is a critical vulnerability in SICK FX0-GENT00000, SICK FX0-GENT00030, SICK FX0-GMOD00000, SICK FX0-GMOD00010, SICK FX0-GPNT00000, SICK FX0-GPNT00030, SICK UE410-EN1, SICK UE410-EN3, SICK UE410-EN3S04, SICK UE410-EN4, published on 19 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-23451 in the wild and no public exploit code.

Affected product: SICK FX0-GENT00000, SICK FX0-GENT00030, SICK FX0-GMOD00000, SICK FX0-GMOD00010, SICK FX0-GPNT00000, SICK FX0-GPNT00030, SICK UE410-EN1, SICK UE410-EN3, SICK UE410-EN3S04, SICK UE410-EN4. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-23451/ (Markdown: https://insights.sbomify.com/CVE-2023-23451/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-23451
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-23451
- OSV: https://osv.dev/vulnerability/CVE-2023-23451

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-23451/
Summaries are generated and may contain mistakes; the official description above is the record.