CVE-2023-27988

7.2 highEPSS 1.4%

High (7.2) in zyxel. EPSS 1.4% chance of exploitation in the next 30 days.

The post-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.13)C0 could allow an authenticated attacker with administrator privileges to execute some operating system (OS) commands on an affected device remotely.

Severity

CVSS 3.1

7.2 high

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.4% chance of exploitation in the next 30 days; higher than 71% of CVEs (scores of 2026-10-31)
CWE: CWE-78
Published: 2023-05-30
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

zyxel:nas326_firmware
zyxel:nas540_firmware
zyxel:nas542_firmware

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-post-authentication-command-injection-vulnerability-in-nas-products
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-post-authentication-command-injection-vulnerability-in-nas-products

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