CVE-2021-35029

CRITICAL

Zyxel USG/Zywall Series Firmware 4.35-4.64 - Authentication Bypass

Title source: llm
STIX 2.1

Description

An authentication bypasss vulnerability in the web-based management interface of Zyxel USG/Zywall series firmware versions 4.35 through 4.64 and USG Flex, ATP, and VPN series firmware versions 4.35 through 5.01, which could allow a remote attacker to execute arbitrary commands on an affected device.

References (1)

Core 1

Scores

CVSS v3 9.8
EPSS 0.0020
EPSS Percentile 41.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-287
Status published
Products (37)
zyxel/usg1000_firmware 4.35 - 4.64
zyxel/usg100_firmware 4.35 - 4.64
zyxel/usg1100_firmware 4.35 - 4.64
zyxel/usg110_firmware 4.35 - 4.64
zyxel/usg1900_firmware 4.35 - 4.64
zyxel/usg20-vpn_firmware 4.35 - 5.01
zyxel/usg2000_firmware 4.35 - 4.64
zyxel/usg200_firmware 4.35 - 4.64
zyxel/usg20_firmware 4.35 - 4.64
zyxel/usg20w-vpn_firmware 4.35 - 5.01
... and 27 more
Published Jul 02, 2021
Tracked Since Feb 18, 2026