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CVE-2023-27992

Published: Jun 19, 2023Updated: Oct 27, 2025 Sources: CVE List NVD BDUCWE-78
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
84.3%
Top 0.3%
CISA KEV
Active Exploitation
Since Jun 23, 2023
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

nas326 firmwarezyxelNetworking Infrastructure
nas540 firmwarezyxelNetworking Infrastructure
nas542 firmwarezyxelNetworking Infrastructure
NAS326 firmwareZyxelNetworking Infrastructure
NAS540 firmwareZyxelNetworking Infrastructure
zyxelcommercialTWNetworking Infrastructureaka zyxel communications corp.
and 4 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jun 23, 2023
Remediation due:Jul 14, 2023

Required action: Apply updates per vendor instructions.

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
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References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products
zyxel.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992
cisa.gov

Timeline

Published
Jun 19, 2023
Added to CISA KEV
Jun 23, 2023
Last Updated
Oct 27, 2025

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