CVE-2025-13943

high-risk

Published 2026-02-24

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.

Do I need to act?

0.05% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 8.8/10 High

NETWORK / LOW complexity

Affected Products (20)

Ee5301-00 Firmware

Ee3301-00 Firmware

Dx5401-B1 Firmware

Dx4510-B1 Firmware

Dx4510-B0 Firmware

Dx3301-T0 Firmware

Dx3300-T1 Firmware

Dx3300-T0 Firmware

Ee6510-10 Firmware

Emg3525-T50B Firmware

Emg5523-T50B Firmware

Ex2210-T0 Firmware

Ex3300-T0 Firmware

Ex3300-T1 Firmware

Ex3301-T0 Firmware

Ex3500-T0 Firmware

Ex3501-T0 Firmware

Ex3510-B0 Firmware

Ex3510-B1 Firmware

Ex3600-T0 Firmware

Affected Vendors

Zyxel

References (1)

Vendor Advisory https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advis...

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high-risk

Severity 30/34 · Critical

Exploitability 0/34 · Minimal

Exposure 26/34 · High