CVE-2023-27990

Published: Apr 24, 2023Modified: Feb 25, 2026

4.8

Vector

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

Exploitability: 1.7 / Impact: 2.7

Source: NVD

Description

The cross-site scripting (XSS) vulnerability in Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow an authenticated attacker with administrator privileges to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed when the user visits the Logs page of the GUI on the device.

Affected (19)

Products: Zyxel: Atp200 Firmware, Atp100 Firmware, Atp700 Firmware, Atp500 Firmware, Atp100w 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 20w Vpn Firmware, Usg Flex 50w Firmware, Usg20 Vpn Firmware, Vpn100 Firmware, Vpn1000 Firmware, Vpn300 Firmware, Vpn50 Firmware

Configuration A

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp200 Firmware	From 4.32 to 5.36

Running on/with	Platform Versions
Zyxel Atp200	All versions

Configuration B

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp100 Firmware	From 4.32 to 5.36

Running on/with	Platform Versions
Zyxel Atp100	All versions

Configuration C

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp700 Firmware	From 4.32 to 5.36

Running on/with	Platform Versions
Zyxel Atp700	All versions

Configuration D

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp500 Firmware	From 4.32 to 5.36

Running on/with	Platform Versions
Zyxel Atp500	All versions

Configuration E

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp100w Firmware	From 4.32 to 5.36

Running on/with	Platform Versions
Zyxel Atp100w	All versions

Configuration F

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Atp800 Firmware	From 4.32 to 5.36

Running on/with	Platform Versions
Zyxel Atp800	All versions

Configuration G

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 100 Firmware	From 4.50 to 5.36

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

Configuration H

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 50 Firmware	From 4.50 to 5.36

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

Configuration I

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 200 Firmware	From 4.50 to 5.36

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

Configuration J

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 500 Firmware	From 4.50 to 5.36

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

Configuration K

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 700 Firmware	From 4.50 to 5.36

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

Configuration L

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 100w Firmware	From 4.50 to 5.36

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

Configuration M

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg 20w Vpn Firmware	From 4.16 to 5.36

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

Configuration N

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg Flex 50w Firmware	From 4.16 to 5.36

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

Configuration O

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Usg20 Vpn Firmware	From 4.30 to 5.36

Running on/with	Platform Versions
Zyxel Usg20 Vpn	All versions

Configuration P

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn100 Firmware	From 4.30 to 5.36

Running on/with	Platform Versions
Zyxel Vpn100	All versions

Configuration Q

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn1000 Firmware	From 4.30 to 5.36

Running on/with	Platform Versions
Zyxel Vpn1000	All versions

Configuration R

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn300 Firmware	From 4.30 to 5.36

Running on/with	Platform Versions
Zyxel Vpn300	All versions

Configuration S

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Zyxel Vpn50 Firmware	From 4.30 to 5.36

Running on/with	Platform Versions
Zyxel Vpn50	All versions

Related CWEs

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (2)

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls

Source: security@zyxel.com.tw

Vendor Advisory

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls

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

Vendor Advisory

Timeline

No history available yet.