CVE-2023-27992
CriticalActively exploited (CISA KEV)
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.
SeverityCritical
CVSS9.8
Exploit probability100. percentile82.3%
Product
Zyxel Multiple Network-Attached Storage (NAS) Devices
PublishedJun 19, 2023
First seenJun 19, 2023
Added to KEVJun 23, 2023
Weakness typeCWE-78OS command injection
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: Jul 14, 2023Update
- zyxel nas326_firmware5.21\(aazf.14\)c0 or later
- zyxel nas540_firmware5.21\(aatb.11\)c0 or later
- zyxel nas542_firmware5.21\(abag.11\)c0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zyxel nas326_firmware | v < 5.21\(aazf.14\)c0 | 5.21\(aazf.14\)c0 |
| zyxel nas540_firmware | v < 5.21\(aatb.11\)c0 | 5.21\(aatb.11\)c0 |
| zyxel nas542_firmware | v < 5.21\(abag.11\)c0 | 5.21\(abag.11\)c0 |
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