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CVE-2021-35029

Quick assessment

Affected
Zyxel USG/Zywall series Firmware
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zyxel ZyXEL ZyWALL USG是中国台湾合勤（Zyxel）公司的一款网络安全防火墙设备。 ZyXEL ZyWALL USG存在授权问题漏洞，该漏洞源于网络系统或产品中缺少身份验证措施或身份验证强度不足。远程攻击者可以利用该漏洞在目标设备上执行任意代码。

CVSS 9.8 · Critical EPSS 2.25% · P82

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-35029

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ZyXEL ZyWALL USG 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zyxel ZyXEL ZyWALL USG是中国台湾合勤（Zyxel）公司的一款网络安全防火墙设备。 ZyXEL ZyWALL USG存在授权问题漏洞，该漏洞源于网络系统或产品中缺少身份验证措施或身份验证强度不足。远程攻击者可以利用该漏洞在目标设备上执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zyxel USG/Zywall series Firmware 4.35 through 4.64 -
Zyxel USG FLEX series Firmware 4.35 through 5.01 -
Zyxel ATP series Firmware 4.35 through 5.01 -
Zyxel VPN series Firmware 4.35 through 5.01 -

II. Public POCs for CVE-2021-35029

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III. Intelligence Information for CVE-2021-35029

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Other References for CVE-2021-35029 (1)

IV. Related Vulnerabilities

Same product: USG/Zywall series Firmware
Same vendor: Zyxel
Same weakness: CWE-287

V. Comments for CVE-2021-35029

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