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CVE-2023-34139

Quick assessment

Affected
Zyxel USG FLEX 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 USG FLEX是中国合勤（Zyxel）公司的一款防火墙。提供灵活的 VPN 选项（IPsec、SSL 或 L2TP），为远程工作和管理提供灵活的安全远程访问。 Zyxel USG FLEX 存在安全漏洞，该漏洞源于Free Time WiFi 热点功能中存在命令注入，允许未经身份验证的基于 LAN 的攻击者在受影响的设备上执行操作系统命令。

CVSS 8.8 · High EPSS 0.76% · P54
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I. Basic Information for CVE-2023-34139

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Zyxel USG FLEX 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zyxel USG FLEX是中国合勤（Zyxel）公司的一款防火墙。提供灵活的 VPN 选项（IPsec、SSL 或 L2TP），为远程工作和管理提供灵活的安全远程访问。 Zyxel USG FLEX 存在安全漏洞，该漏洞源于Free Time WiFi 热点功能中存在命令注入，允许未经身份验证的基于 LAN 的攻击者在受影响的设备上执行操作系统命令。
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 FLEX series firmware 4.50 through 5.36 Patch 2 -
Zyxel VPN series firmware 4.20 through 5.36 Patch 2 -

II. Public POCs for CVE-2023-34139

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III. Intelligence Information for CVE-2023-34139

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Other References for CVE-2023-34139 (1)

Same Patch Batch · Zyxel · 2023-07-17 · 7 CVEs total

CVE-2023-28767 8.8 HIGH Zyxel ATP 操作系统命令注入漏洞
CVE-2023-33011 8.8 HIGH Zyxel ATP 格式化字符串错误漏洞
CVE-2023-33012 8.8 HIGH Zyxel ATP 操作系统命令注入漏洞
CVE-2023-34138 8.0 HIGH Zyxel ATP 操作系统命令注入漏洞
CVE-2023-34141 8.0 HIGH Zyxel ATP 操作系统命令注入漏洞
CVE-2023-34140 6.5 MEDIUM Zyxel ATP 安全漏洞

IV. Related Vulnerabilities

Same product: USG FLEX series firmware
Same vendor: Zyxel
Same weakness: CWE-78

V. Comments for CVE-2023-34139

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