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🟣 EPSS 89%🦅 CISA Reported

What is CVE-2023-27992?

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 has reported CVE-2023-27992

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 CVE-2023-27992 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...

EPSS Score

89% chance of being exploited in the next 30 days.

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

.