CVE-2024-29973: Zyxel NAS326 Firmware

Critical severity, CVSS 9.8. EPSS: 86.1% chance of exploitation in the next 30 days.

** UNSUPPORTED WHEN ASSIGNED ** The command injection vulnerability in the “setCookie” parameter 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.

Affected products

• Zyxel NAS326 Firmware: before 5.21\(aazf.17\)c0 (fixed in 5.21\(aazf.17\)c0)
• Zyxel NAS542 Firmware: before 5.21\(abag.14\)c0 (fixed in 5.21\(abag.14\)c0)

Published 2024-06-04. Last modified 2026-06-17.