Unauthorized Remote Code Execution Vulnerability in Zyxel ATP Series Firmware
CVE-2023-6764

8.1HIGH

Key Information:

Vendor

Zyxel
Status
ATP series firmware
USG FLEX series firmware
USG FLEX 50(W) series firmware
USG20(W)-VPN series firmware
Vendor
CVE Published:
20 February 2024

What is CVE-2023-6764?

A format string vulnerability exists in the IPSec VPN feature of Zyxel's firmware, specifically impacting several models within the ATP and USG FLEX series. This vulnerability may allow an attacker to execute unauthorized remote code by utilizing a sequence of specially crafted payloads that exploit an invalid pointer. Successfully carrying out an attack necessitates a comprehensive understanding of the targeted device's memory layout and configuration, potentially making exploitation challenging.

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Affected Version(s)

ATP series firmware version 4.32 through 5.37 Patch 1

USG FLEX 50(W) series firmware version 4.16 through 5.37 Patch 1

USG FLEX series firmware version 4.50 through 5.37 Patch 1

References

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

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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