RCE in Zyxel Nas326
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 by sending a crafted URL to a vulnerable device.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.413 (98.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.413 · newest: 0.413 · change: 0.000
Affected products
- Zyxel Nas326
- Zyxel Nas326 Firmware — versions V5.21(AAZF.14)C0
- Zyxel Nas326 Firmware
- Zyxel Nas542
- Zyxel Nas542 Firmware — versions V5.21(ABAG.11)C0
- Zyxel Nas542 Firmware
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for… (vendor-advisory, Patch, Vendor Advisory)
- bugprove.com/knowledge-hub/cve-2023-4473-and-cve-2023-4474-authentication-bypas…
Frequently asked questions
- What is CVE-2023-4473?
- CVE-2023-4473 is a critical-severity vulnerability in Zyxel Nas326, 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.