# CVE-2023-5376: TFTP Without Authentication

> Attackers can access the TFTP service without authentication to read or modify files on Korenix JetNet devices.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jan 2024
- **Updated:** 8 Oct 2025
- **Also known as:** GHSA-4f22-7h3g-c989

## What is CVE-2023-5376?

CVE-2023-5376 is a high-severity missing authorization vulnerability in Korenix JetNet Series, published on 9 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An Improper Authentication vulnerability in Korenix JetNet TFTP allows abuse of this service. This issue affects JetNet devices older than firmware version 2024/01.

Weakness: CWE-287 (Improper Authentication), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2023-5376?

It affects 42 products.


Products: Korenix Jetnet 4508-W Firmware, Korenix Jetnet 4508 Firmware, Korenix Jetnet 4508f-M Firmware, Korenix Jetnet 4508f-Mw Firmware, Korenix Jetnet 4508f-S Firmware, Korenix Jetnet 4508f-Sw Firmware, Korenix Jetnet 4508i-W Firmware, Korenix Jetnet 4508if-M Firmware, Korenix Jetnet 4508if-Mw Firmware, Korenix Jetnet 4508if-S Firmware, Korenix Jetnet 4508if-Sw Firmware, Korenix Jetnet 5310g Firmware, Korenix Jetnet 5612g-4f Firmware, Korenix Jetnet 5612gp-4f Firmware, Korenix Jetnet 5620g-4c Firmware, Korenix Jetnet 5728g-24p-Ac-2dc-Eu Firmware, Korenix Jetnet 5728g-24p-Ac-2dc-Us Firmware, Korenix Jetnet 6528gf-2ac-Eu Firmware, Korenix Jetnet 6528gf-2ac-Us Firmware, Korenix Jetnet 6528gf-2dc24 Firmware and 22 more.

## How do I fix CVE-2023-5376?

No fix has been published for CVE-2023-5376 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-5376 being exploited?

There is no known exploitation of CVE-2023-5376 in the wild and no public exploit code.

## Other vulnerabilities in Korenix JetNet Series

- [CVE-2023-5347](https://insights.sbomify.com/CVE-2023-5347/): Unauthenticated Firmware Upgrade (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5376 and fix it if it is affected.

What it is: CVE-2023-5376 is a high-severity missing authorization vulnerability in Korenix JetNet Series, published on 9 Jan 2024. 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-2023-5376 in the wild and no public exploit code.

Affected product: Korenix JetNet Series. 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-2023-5376/ (Markdown: https://insights.sbomify.com/CVE-2023-5376/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5376
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5376
- OSV: https://osv.dev/vulnerability/CVE-2023-5376

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5376/
Summaries are generated and may contain mistakes; the official description above is the record.