CVE-2023-27992
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 |
| Vendor | zyxel |
| Product | nas326 firmware |
| Published | Jun 19, 2023 |
| Last Updated | Oct 21, 2025 |
⚠️ Actively Exploited — Act Now
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Zyxel / NAS326 firmware
< V5.21(AAZF.14)C0
Zyxel / NAS540 firmware
< V5.21(AATB.11)C0
Zyxel / NAS542 firmware
< V5.21(ABAG.11)C0