CVE-2023-27992
Published: June 23, 2023
Official 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.
CISA KEV Advisory
Zyxel Multiple NAS Devices Command Injection Vulnerability
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.
Apply updates per vendor instructions.
Risk Analysis
This flaw in Zyxel network-attached storage (NAS) devices allows an attacker to execute commands remotely without needing to authenticate. The high EPSS score of 0.86532 suggests a very high probability of exploitation, making immediate attention critical.
This vulnerability is actively being exploited in the wild and is included in CISA's KEV catalog, indicating confirmed exploitation by malicious actors. It is remotely exploitable.
Apply available patches or firmware updates for your Zyxel NAS devices. Restrict network access to these devices where possible.
Technical Analysis
CVE-2023-27992 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2023-27992 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-27992 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1