OS Command Injection in ZyXEL Communications Corp. products - CVE-2026-0711

Vulnerability identifier: #VU128269

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2026-0711

CWE-ID: CWE-78

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

Vendor: ZyXEL Communications Corp.

Affected software:
NR5307
Nebula FWA515
DX3300-T0
DX3300-T1
DX3301-T0
DX5401-B1
EE3301-00
EE5301-00
EE6510-10
EX3300-T0
EX3300-T1
EX3301-T0
EX3500-T0
EX3501-T0
EX3600-T0
EX5401-B1
EX5512-T0
EX5601-T0
EX5601-T1
EX7501-B0
AX7501-B1
PE3301-00
PE5301-01
PX5302-00
PX5301-T0
WE3300-00
WX3100-T0
WE4600-00
WX5600-T0
DX5401-B0
EMG3525-T50B
EMG5523-T50B
EX5401-B0
VMG3625-T50B
VMG8623-T50B
AX7501-B0

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the EasyMesh-related APIs. A remote administrator on the local network can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Install updates from vendor's website.

• https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-vulnerabilities-in-certain-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-and-wireless-extenders-04-28-2026