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CVE-2023-33009

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CVE-2023-33009

Published: May 24, 2023

Modified: Oct 21, 2025

PUBLISHED

CVSS v3.1

9.8

CRITICAL

Description

A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.60 through 5.36 Patch 1, VPN series firmware versions 4.60 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.60 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.

VendorProductVersions

Zyxel

ATP series firmware

affected
4.60 through 5.36 Patch 1

Zyxel

USG FLEX series firmware

affected
4.60 through 5.36 Patch 1

Zyxel

USG FLEX 50(W) firmware

affected
4.60 through 5.36 Patch 1

Zyxel

USG20(W)-VPN firmware

affected
4.60 through 5.36 Patch 1

Zyxel

VPN series firmware

affected
4.60 through 5.36 Patch 1

Zyxel

ZyWALL/USG series firmware

affected
4.60 through 4.73 Patch 1

Weaknesses (CWE)

CWE-120

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

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