The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versions prior to V5.21(AATB.11)C0, and NAS542 firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.
CVE ID: CVE-2023-27992
CVSS Base Severity: CRITICAL
CVSS Base Score: 9.8
Vendor: Zyxel
Product: NAS326 firmware
EPSS Score: 2.94% (probability of being exploited)
EPSS Percentile: 90.74% (scored less or equal to compared to others)
EPSS Date: 2025-02-03 (when was this score calculated)