Actively exploited · Published Jun 19, 2023 · Assigned by Zyxel
CVE-2023-27992
Critical 9.8 Exploited
In plain English
A critical-severity OS command injection in NAS326 firmware from Zyxel. Attackers are actively exploiting it in the wild (listed by CISA on June 23, 2023). The chance it is exploited in the next 30 days is estimated at 82.3% (higher than 99.7% of all known vulnerabilities). Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Jul 14, 2023.
Official 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.
Affected products (as reported)
| Vendor | Product | 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 |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H