Critical severity · published Jun 19, 2023
CVE-2023-27992
Zyxel Multiple NAS Devices Command Injection Vulnerability
In wildKEV
9.8
CVSS
82.3%
EPSS
Yes
On 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)82.3% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Jun 23, 2023
Federal remediation dueJul 14, 2023
Ransomware campaign useNot known
Affected products
Which versions
NF
NAS326 firmware · Zyxel
< V5.21(AAZF.14)C0 · source: vendor, NVD
NF
NAS540 firmware · Zyxel
< V5.21(AATB.11)C0 · source: vendor, NVD
NF
NAS542 firmware · Zyxel
< V5.21(ABAG.11)C0 · source: vendor, NVD
MN
Multiple Network-Attached Storage (NAS) Devices · Zyxel
All versions, or not specified · source: KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-27992
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-27992
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
www.zyxel.com
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products
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