CISA-confirmed known exploited vulnerability

CVE-2020-9054

Zyxel Multiple NAS Devices OS Command Injection Vulnerability

Zyxel · Multiple Network-Attached Storage (NAS) Devices

Vulnerability details

Multiple Zyxel network-attached storage (NAS) devices contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code.

Added to CISA KEV: 2022-03-25

Ransomware campaign use: Unknown

CISA due date: 2022-04-15

Defensive guidance from CISA

Apply updates per vendor instructions.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.

Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC

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