Is CVE-2023-33009 actively exploited?

CVE-2023-33009 has no public evidence of in-the-wild exploitation as of 2025-10-27.

What is the CVSS score for CVE-2023-33009?

CVE-2023-33009 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2023-33009?

Patch guidance is available from zyxel security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2023-33009.

Fix CVE-2023-33009 - CRITICAL zyxel atp100 firmware

Q: Which products are affected by CVE-2023-33009?

69 products: zyxel atp100 firmware, zyxel atp100 firmware, zyxel atp100 firmware, zyxel atp200 firmware, zyxel atp200 firmware, and 64 more.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-120 CWE-120

Metadata

Primary Vendor: ZYXEL
Published: 5/24/2023
Last Modified: 10/27/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

zyxel : atp100_firmwarezyxel : atp100_firmwarezyxel : atp100_firmwarezyxel : atp200_firmwarezyxel : atp200_firmwarezyxel : atp200_firmwarezyxel : atp500_firmwarezyxel : atp500_firmwarezyxel : atp500_firmwarezyxel : atp100w_firmwarezyxel : atp100w_firmwarezyxel : atp100w_firmwarezyxel : atp700_firmwarezyxel : atp700_firmwarezyxel : atp700_firmwarezyxel : atp800_firmwarezyxel : atp800_firmwarezyxel : atp800_firmwarezyxel : usg_flex_100_firmwarezyxel : usg_flex_100_firmwarezyxel : usg_flex_100_firmwarezyxel : usg_flex_50_firmwarezyxel : usg_flex_50_firmwarezyxel : usg_flex_50_firmwarezyxel : usg_flex_200_firmwarezyxel : usg_flex_200_firmwarezyxel : usg_flex_200_firmwarezyxel : usg_flex_500_firmwarezyxel : usg_flex_500_firmwarezyxel : usg_flex_500_firmwarezyxel : usg_flex_700_firmwarezyxel : usg_flex_700_firmwarezyxel : usg_flex_700_firmwarezyxel : usg_flex_100_firmwarezyxel : usg_flex_100w_firmwarezyxel : usg_flex_100w_firmwarezyxel : usg_flex_50w_firmwarezyxel : usg_flex_50w_firmwarezyxel : usg_flex_50w_firmwarezyxel : usg_20w-vpn_firmwarezyxel : usg_20w-vpn_firmwarezyxel : usg_20w-vpn_firmwarezyxel : vpn100_firmwarezyxel : vpn100_firmwarezyxel : vpn100_firmwarezyxel : vpn50_firmwarezyxel : vpn50_firmwarezyxel : vpn50_firmwarezyxel : vpn300_firmwarezyxel : vpn300_firmwarezyxel : vpn300_firmwarezyxel : vpn1000_firmwarezyxel : vpn1000_firmwarezyxel : vpn1000_firmwarezyxel : usg20-vpn_firmwarezyxel : usg20-vpn_firmwarezyxel : usg20-vpn_firmwarezyxel : usg_40_firmwarezyxel : usg_40_firmwarezyxel : usg_40_firmwarezyxel : usg_40w_firmwarezyxel : usg_40w_firmwarezyxel : usg_40w_firmwarezyxel : usg_60w_firmwarezyxel : usg_60w_firmwarezyxel : usg_60w_firmwarezyxel : usg_60_firmwarezyxel : usg_60_firmwarezyxel : usg_60_firmware

Remediation Guidance

Executive Summary

View on NIST NVD