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CVE-2023-34140

Quick assessment

Affected
Zyxel ATP 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 ATP是中国合勤（Zyxel）公司的一款防火墙。 Zyxel ATP ZLD V4.32 到 V5.36 Patch 2版本、USG FLEX ZLD V4.50到 V5.36 Patch 2版本、USG FLEX 50(W) / USG20(W)-VPN ZLD V4.16 到 V5.36 Patch 2版本、VPN ZLD V4.30 到 V5.36 Patch 2版本存在安全漏洞，该漏洞源于允许未经身份验证的基于 LAN 的攻击者在受影响的设备上通过向 CAPWAP 守护程序发送精心设计

CVSS 6.5 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-34140

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 4.16 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 4.16 through 5.36 Patch 2, VPN series firmware versions 4.30 through 5.36 Patch 2, NXC2500 firmware versions 6.10(AAIG.0) through 6.10(AAIG.3), and NXC5500 firmware versions 6.10(AAOS.0) through 6.10(AAOS.4), could allow an unauthenticated, LAN-based attacker to cause denial of service (DoS) conditions by sending a crafted request to the CAPWAP daemon.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Zyxel ATP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zyxel ATP是中国合勤（Zyxel）公司的一款防火墙。 Zyxel ATP ZLD V4.32 到 V5.36 Patch 2版本、USG FLEX ZLD V4.50到 V5.36 Patch 2版本、USG FLEX 50(W) / USG20(W)-VPN ZLD V4.16 到 V5.36 Patch 2版本、VPN ZLD V4.30 到 V5.36 Patch 2版本存在安全漏洞，该漏洞源于允许未经身份验证的基于 LAN 的攻击者在受影响的设备上通过向 CAPWAP 守护程序发送精心设计
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 ATP series firmware 4.32 through 5.36 Patch 2 -
Zyxel USG FLEX series firmware 4.50 through 5.36 Patch 2 -
Zyxel USG FLEX 50(W) series firmware 4.16 through 5.36 Patch 2 -
Zyxel USG20(W)-VPN series firmware 4.16 through 5.36 Patch 2 -
Zyxel VPN series firmware 4.30 through 5.36 Patch 2 -
Zyxel NXC2500 firmware 6.10(AAIG.0) through 6.10(AAIG.3) -
Zyxel NXC5500 firmware 6.10(AAOS.0) through 6.10(AAOS.4) -

II. Public POCs for CVE-2023-34140

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III. Intelligence Information for CVE-2023-34140

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Other References for CVE-2023-34140 (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-2023-34139 8.8 HIGH Zyxel USG FLEX 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

IV. Related Vulnerabilities

Same product: ATP series firmware
Same vendor: Zyxel
Same weakness: CWE-120

V. Comments for CVE-2023-34140

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