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.
Published: 2023-05-24
Score: 9.8 Critical
EPSS: 6.2% Low
KEV: Yes
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

No remediation available yet.

Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2023-37198 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.
History

Thu, 26 Feb 2026 15:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*

Wed, 25 Feb 2026 16:45:00 +0000

Type Values Removed Values Added
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. 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.

Tue, 21 Oct 2025 23:30:00 +0000


Tue, 21 Oct 2025 20:30:00 +0000


Tue, 21 Oct 2025 19:30:00 +0000


Tue, 04 Feb 2025 17:15:00 +0000

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2023-06-05'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Subscriptions

Zyxel Atp100 Atp100 Firmware Atp100w Atp100w Firmware Atp200 Atp200 Firmware Atp500 Atp500 Firmware Atp700 Atp700 Firmware Atp800 Atp800 Firmware Usg20-vpn Usg20-vpn Firmware Usg 20w-vpn Usg 20w-vpn Firmware Usg 40 Usg 40 Firmware Usg 40w Usg 40w Firmware Usg 60 Usg 60 Firmware Usg 60w Usg 60w Firmware Usg Flex 100 Usg Flex 100 Firmware Usg Flex 100w Usg Flex 100w Firmware Usg Flex 200 Usg Flex 200 Firmware Usg Flex 50 Usg Flex 500 Usg Flex 500 Firmware Usg Flex 50 Firmware Usg Flex 50w Usg Flex 50w Firmware Usg Flex 700 Usg Flex 700 Firmware Vpn100 Vpn1000 Vpn1000 Firmware Vpn100 Firmware Vpn300 Vpn300 Firmware Vpn50 Vpn50 Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: Zyxel

Published:

Updated: 2025-10-21T23:05:47.636Z

Reserved: 2023-05-17T00:00:00.000Z

Link: CVE-2023-33009

cve-icon Vulnrichment

Updated: 2024-08-02T15:32:46.565Z

cve-icon NVD

Status : Analyzed

Published: 2023-05-24T13:15:09.560

Modified: 2026-02-26T15:03:56.120

Link: CVE-2023-33009

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses