CVE-2023-27992 Zyxel Multiple Network-Attached Storage (NAS) Devices: command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline Jul 14, 2023
What to do
- Install Zyxel's security update for Multiple Network-Attached Storage (NAS) Devices. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic firmware updates and replace gear the maker no longer supports.
- Change default passwords and switch off remote administration and features you do not use.
- Do not put storage boxes or cameras directly on the internet — use the maker's app or a VPN.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Taken over in bulk to join botnets, used to watch your traffic, or — for storage boxes — locked by ransomware.
The details
- Official name
- Zyxel Multiple NAS Devices Command Injection Vulnerability
- Product
- Zyxel Multiple Network-Attached Storage (NAS) Devices
- CISA description
- Multiple Zyxel network-attached storage (NAS) devices contain a pre-authentication command injection vulnerability that could allow an unauthenticated attacker to execute commands remotely via a crafted HTTP request.
- Type of flaw
- Command or code injection (CWE-78)
- Confirmed exploited
- Jun 23, 2023
- US federal patch deadline
- Jul 14, 2023
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Answering about CVE-2023-27992 ·
Questions about CVE-2023-27992
Is CVE-2023-27992 being exploited?
Yes. CISA added CVE-2023-27992 to its Known Exploited Vulnerabilities catalog on Jun 23, 2023, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2023-27992?
Install Zyxel's security update for Multiple Network-Attached Storage (NAS) Devices. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic firmware updates and replace gear the maker no longer supports.
Am I affected by CVE-2023-27992?
Only if you use Zyxel Multiple Network-Attached Storage (NAS) Devices. This one is aimed at devices or apps of the kind people own.