# CVE-2023-27992

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.

- Page: https://www.vulneraibility.com/cve/CVE-2023-27992
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2023-06-23; CISA due date 2023-07-14
- EPSS: 82.26% (percentile 99.7)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-01-27)
- Weakness: CWE-78
- Published: 2023-06-19

## Affected

- zyxel:nas326_firmware
- zyxel:nas540_firmware
- zyxel:nas542_firmware

## References

- [other] https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.