What is CVE-2025-13943?

CVE-2025-13943 is a high-severity vulnerability in Zyxel Ex3301-t0 Firmware, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-02-24.

How severe is CVE-2025-13943?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Zyxel Ex3301-t0 Firmware

CVE-2025-13943

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 a…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.001 (22.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zyxel Ex3301-t0 Firmware — versions <= 5.50(ABVY.7)C0

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for… (vendor-advisory)

Frequently asked questions

What is CVE-2025-13943?: CVE-2025-13943 is a high-severity vulnerability in Zyxel Ex3301-t0 Firmware, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-02-24.
How severe is CVE-2025-13943?: High severity. CVSS v3 base score is 8.8 out of 10.