Pre-Authentication Command Injection Vulnerability in Zyxel NAS Devices
CVE-2023-27992

9.8CRITICAL

Key Information:

Vendor
Zyxel
Status
Nas326 Firmware
Nas540 Firmware
Nas542 Firmware
Vendor
CVE Published:
19 June 2023

Badges

👾 Exploit Exists🦅 CISA Reported

Summary

A pre-authentication command injection vulnerability exists in certain Zyxel NAS firmware versions, which could permit an unauthenticated attacker to execute system-level commands remotely. This is accomplished by sending specially crafted HTTP requests, potentially leading to unauthorized access and manipulation of the device's operating system.

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply updates per vendor instructions.

Affected Version(s)

NAS326 firmware < V5.21(AAZF.14)C0

NAS540 firmware < V5.21(AATB.11)C0

NAS542 firmware < V5.21(ABAG.11)C0

References

https://www.zyxel.com/global/en/support/security-advisori...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • Vulnerability published

  • Vulnerability Reserved

.