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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
Which versions are affected by CVE-2025-13943?
It affects 52 products.
Products include Zyxel Am7510-00 Firmware, Zyxel Ax7501-B1 Firmware, Zyxel Dm4200-B0 Firmware, Zyxel Dx3300-T0 Firmware, Zyxel Dx3300-T1 Firmware, Zyxel Dx3301-T0 Firmware and 46 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.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
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
Sources
Also known as GHSA-mg73-f2jm-wph7.