Zyxel security advisory for pre-authentication command injection vulnerability in NAS products




CVE: CVE-2023-27992
Summary
Zyxel has released patches addressing a pre-authentication command injection vulnerability in some NAS versions. Users are advised to install them for optimal protection.
What is the vulnerability?
The pre-authentication command injection vulnerability in some Zyxel NAS devices could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.
What versions are vulnerable—and what should you do?
After a thorough investigation, we have identified the vulnerable products that are within their vulnerability support period, with their firmware patches shown in the table below.
Affected model | Affected version | Patch availability |
---|---|---|
NAS326 | V5.21(AAZF.13)C0 and earlier | |
NAS540 | V5.21(AATB.10)C0 and earlier | |
NAS542 | V5.21(ABAG.10)C0 and earlier |
Got a question?
Please contact your local service rep or visit Zyxel’s community for further information or assistance.
Acknowledgment
Thanks to Andrej Zaujec, NCSC-FI, and Maxim Suslov for reporting the issue to us.
Revision history
2023-06-20: Initial release.
Categories
- All Categories
- 435 Beta Program
- 2.7K Nebula
- 183 Nebula Ideas
- 120 Nebula Status and Incidents
- 6.2K Security
- 439 USG FLEX H Series
- 299 Security Ideas
- 1.6K Switch
- 80 Switch Ideas
- 1.2K Wireless
- 44 Wireless Ideas
- 6.7K Consumer Product
- 276 Service & License
- 433 News and Release
- 88 Security Advisories
- 31 Education Center
- 10 [Campaign] Zyxel Network Detective
- 4.2K FAQ
- 34 Documents
- 34 Nebula Monthly Express
- 84 About Community
- 91 Security Highlight