Zyxel · Zyxel Nas542 · CVE-2023-37928
**Name of the Vulnerable Software and Affected Versions**
Zyxel NAS326 version V5.21(AAZF.14)C0
Zyxel NAS542 version V5.21(ABAG.11)C0
**Description**
A post-authentication command injection issue in the WSGI server of the Zyxel NAS326 and NAS542 firmware could allow an authenticated attacker to execute some operating system (OS) commands by sending a crafted URL to a vulnerable device. The vulnerability is related to the failure to neutralize special elements used in OS commands, which can be exploited by sending a specially crafted URL to the device.
**Recommendations**
For Zyxel NAS326 version V5.21(AAZF.14)C0, consider disabling the WSGI server until a patch is available.
For Zyxel NAS542 version V5.21(ABAG.11)C0, consider disabling the WSGI server until a patch is available.
As a temporary workaround, avoid using the vulnerable WSGI server functionality until the issue is resolved.