# CVE-2025-13943: Command injection in EX3301-T0 firmware

> An authenticated attacker can execute arbitrary OS commands via the log file download function in Zyxel EX3301-T0 firmware.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Feb 2026
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-mg73-f2jm-wph7

## What is CVE-2025-13943?

CVE-2025-13943 is a high-severity command injection vulnerability in Zyxel EX3301-T0 firmware, published on 24 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A post-authentication command injection vulnerability in the log file download function of the Zyxel EX3301-T0 firmware versions through 5.50(ABVY.7)C0 could allow an authenticated attacker to execute operating system (OS) commands on an affected device.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2025-13943?

It affects 52 products.


Products: Zyxel Am7510-00 Firmware, Zyxel Ax7501-B1 Firmware, Zyxel Dm4200-B0 Firmware, Zyxel Dx3300-T0 Firmware, Zyxel Dx3300-T1 Firmware, Zyxel Dx3301-T0 Firmware, Zyxel Dx4510-B0 Firmware, Zyxel Dx4510-B1 Firmware, Zyxel Dx5401-B1 Firmware, Zyxel Ee3301-00 Firmware, Zyxel Ee5301-00 Firmware, Zyxel Ee6510-10 Firmware, Zyxel Emg3525-T50b Firmware, Zyxel Emg5523-T50b Firmware, Zyxel Emg6726-B10a Firmware, Zyxel Ex2210-T0 Firmware, Zyxel Ex3300-T0 Firmware, Zyxel Ex3300-T1 Firmware, Zyxel Ex3301-T0 Firmware, Zyxel Ex3500-T0 Firmware and 32 more.

## How do I fix CVE-2025-13943?

No fix has been published for CVE-2025-13943 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-13943 being exploited?

There is no known exploitation of CVE-2025-13943 in the wild and no public exploit code.

## Other vulnerabilities in Zyxel EX3301-T0 firmware

- [CVE-2026-1460](https://insights.sbomify.com/CVE-2026-1460/): Command injection in DX3301-T0 firmware (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-13943 and fix it if it is affected.

What it is: CVE-2025-13943 is a high-severity command injection vulnerability in Zyxel EX3301-T0 firmware, published on 24 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-13943 in the wild and no public exploit code.

Affected product: Zyxel EX3301-T0 firmware. 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-2025-13943/ (Markdown: https://insights.sbomify.com/CVE-2025-13943/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-13943
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-13943
- OSV: https://osv.dev/vulnerability/CVE-2025-13943

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-13943/
Summaries are generated and may contain mistakes; the official description above is the record.