CVE-2023-33009

Published: May 24, 2023Modified: Feb 26, 2026CISA KEV

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

Source: NVD (Secondary)

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.

Affected (69)

Products: Zyxel: Atp100 Firmware, Atp200 Firmware, Atp500 Firmware, Atp100w Firmware, Atp700 Firmware, Atp800 Firmware, Usg Flex 100 Firmware, Usg Flex 50 Firmware, Usg Flex 200 Firmware, Usg Flex 500 Firmware, Usg Flex 700 Firmware, Usg Flex 100w Firmware, Usg Flex 50w Firmware, Usg 20w Vpn Firmware, Vpn100 Firmware, Vpn50 Firmware, Vpn300 Firmware, Vpn1000 Firmware, Usg20 Vpn Firmware, Usg 40 Firmware, Usg 40w Firmware, Usg 60w Firmware, Usg 60 Firmware

23 products

Usg Flex 100 Firmware

Usg Flex 50 Firmware

Usg Flex 200 Firmware

Usg Flex 500 Firmware

Usg Flex 700 Firmware

Usg Flex 100w Firmware

Usg Flex 50w Firmware

Configuration A

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp100 Firmware	From 4.60 to 5.36
Zyxel Atp100 Firmware	Version 5.36
Zyxel Atp100 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Atp100	All versions

Configuration B

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp200 Firmware	From 4.60 to 5.36
Zyxel Atp200 Firmware	Version 5.36
Zyxel Atp200 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Atp200	All versions

Configuration C

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp500 Firmware	From 4.60 to 5.36
Zyxel Atp500 Firmware	Version 5.36
Zyxel Atp500 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Atp500	All versions

Configuration D

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp100w Firmware	From 4.60 to 5.36
Zyxel Atp100w Firmware	Version 5.36
Zyxel Atp100w Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Atp100w	All versions

Configuration E

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp700 Firmware	From 4.60 to 5.36
Zyxel Atp700 Firmware	Version 5.36
Zyxel Atp700 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Atp700	All versions

Configuration F

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp800 Firmware	From 4.60 to 5.36
Zyxel Atp800 Firmware	Version 5.36
Zyxel Atp800 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Atp800	All versions

Configuration G

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 100 Firmware	From 4.60 to 5.36
Zyxel Usg Flex 100 Firmware	Version 5.36
Zyxel Usg Flex 100 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg Flex 100	All versions

Configuration H

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 50 Firmware	From 4.60 to 5.36
Zyxel Usg Flex 50 Firmware	Version 5.36
Zyxel Usg Flex 50 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg Flex 50	All versions

Configuration I

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 200 Firmware	From 4.60 to 5.36
Zyxel Usg Flex 200 Firmware	Version 5.36
Zyxel Usg Flex 200 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg Flex 200	All versions

Configuration J

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 500 Firmware	From 4.60 to 5.36
Zyxel Usg Flex 500 Firmware	Version 5.36
Zyxel Usg Flex 500 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg Flex 500	All versions

Configuration K

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 700 Firmware	From 4.60 to 5.36
Zyxel Usg Flex 700 Firmware	Version 5.36
Zyxel Usg Flex 700 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg Flex 700	All versions

Configuration L

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 100w Firmware	From 4.60 to 5.36
Zyxel Usg Flex 100w Firmware	Version 5.36
Zyxel Usg Flex 100w Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg Flex 100w	All versions

Configuration M

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 50w Firmware	From 4.60 to 5.36
Zyxel Usg Flex 50w Firmware	Version 5.36
Zyxel Usg Flex 50w Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg Flex 50w	All versions

Configuration N

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg 20w Vpn Firmware	From 4.60 to 5.36
Zyxel Usg 20w Vpn Firmware	Version 5.36
Zyxel Usg 20w Vpn Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg 20w Vpn	All versions

Configuration O

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn100 Firmware	From 4.60 to 5.36
Zyxel Vpn100 Firmware	Version 5.36
Zyxel Vpn100 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Vpn100	All versions

Configuration P

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn50 Firmware	From 4.60 to 5.36
Zyxel Vpn50 Firmware	Version 5.36
Zyxel Vpn50 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Vpn50	All versions

Configuration Q

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn300 Firmware	From 4.60 to 5.36
Zyxel Vpn300 Firmware	Version 5.36
Zyxel Vpn300 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Vpn300	All versions

Configuration R

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn1000 Firmware	From 4.60 to 5.36
Zyxel Vpn1000 Firmware	Version 5.36
Zyxel Vpn1000 Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Vpn1000	All versions

Configuration S

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg20 Vpn Firmware	From 4.60 to 5.36
Zyxel Usg20 Vpn Firmware	Version 5.36
Zyxel Usg20 Vpn Firmware	Version 5.36 patch1

Running on/with	Platform Versions
Zyxel Usg20 Vpn	All versions

Configuration T

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg 40 Firmware	From 4.60 to 4.73
Zyxel Usg 40 Firmware	Version 4.73
Zyxel Usg 40 Firmware	Version 4.73 patch1

Running on/with	Platform Versions
Zyxel Usg 40	All versions

Configuration U

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg 40w Firmware	From 4.60 to 4.73
Zyxel Usg 40w Firmware	Version 4.73
Zyxel Usg 40w Firmware	Version 4.73 patch1

Running on/with	Platform Versions
Zyxel Usg 40w	All versions

Configuration V

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg 60w Firmware	From 4.60 to 4.73
Zyxel Usg 60w Firmware	Version 4.73
Zyxel Usg 60w Firmware	Version 4.73 patch1

Running on/with	Platform Versions
Zyxel Usg 60w	All versions

Configuration W

3 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg 60 Firmware	From 4.60 to 4.73
Zyxel Usg 60 Firmware	Version 4.73
Zyxel Usg 60 Firmware	Version 4.73 patch1

Running on/with	Platform Versions
Zyxel Usg 60	All versions

Related CWEs

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

References (3)

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls

Source: security@zyxel.com.tw

Vendor Advisory

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-33009

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

Timeline

No history available yet.