What is CVE-2023-4473?

CVE-2023-4473 is a critical-severity vulnerability in Zyxel Nas326 Firmware, classified under OS Command Injection. CVSS score: 9.8/10. Published 2023-11-30.

How severe is CVE-2023-4473?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-4473 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Zyxel Nas326 Firmware

CVE-2023-4473

A command injection vulnerability in the web server of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands b…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.329 (97.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zyxel Nas326 Firmware — versions V5.21(AAZF.14)C0
Zyxel Nas542 Firmware — versions V5.21(ABAG.11)C0

Weakness classification (CWE)

CWE-78 — OS Command Injection

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-4473?: CVE-2023-4473 is a critical-severity vulnerability in Zyxel Nas326 Firmware, classified under OS Command Injection. CVSS score: 9.8/10. Published 2023-11-30.
How severe is CVE-2023-4473?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-4473 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.