CVE-2023-27992 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 82.8% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2023-07-14.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 82.83% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-78 |
| On CISA KEV | yes — remediate by 2023-07-14 |
| Public exploit | none known |
| Published | 2023-06-19 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Zyxel Multiple NAS Devices Command Injection Vulnerability |
|---|---|
| Added | 2023-06-23 |
| Due | 2023-07-14 |
| Vendor / product | Zyxel / Multiple Network-Attached Storage (NAS) Devices |
| Ransomware use | none reported |
Affected (6)
| Vendor | Product |
|---|---|
| zyxel | nas326 |
| zyxel | nas326 firmware |
| zyxel | nas540 |
| zyxel | nas540 firmware |
| zyxel | nas542 |
| zyxel | nas542 firmware |
References
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992
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