Critical (9.8) in zyxel. No vendor fix: the product was unsupported when the CVE was assigned. EPSS 90% chance of exploitation in the next 30 days.
The command injection vulnerability in the CGI program "remote_help-cgi" in Zyxel NAS326 firmware versions before V5.21(AAZF.17)C0 and NAS542 firmware versions before V5.21(ABAG.14)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted HTTP POST request.
Severity
CVSS 3.1
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
90% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)