Post-Authentication Command Injection in Zyxel EX3301-T0 Firmware
CVE-2025-13943

8.8HIGH

Key Information:

Vendor

Zyxel
Status
Ex3301-t0 Firmware
Vendor
CVE Published:
24 February 2026

What is CVE-2025-13943?

A post-authentication command injection vulnerability exists in the log file download function of Zyxel EX3301-T0 firmware. An authenticated attacker could exploit this flaw to execute arbitrary operating system commands on the affected device, potentially leading to unauthorized access and manipulation of system resources. This security risk emphasizes the need for timely updates and patches to ensure firmware integrity and protect against misuse.

Affected Version(s)

EX3301-T0 firmware <= 5.50(ABVY.7)C0

References

https://www.zyxel.com/global/en/support/security-advisori...
vendor-advisory

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.