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CVE-2021-34566— WAGO I/O-Check Service prone to Memory Overflow

CVSS 9.1 · Critical EPSS 0.90% · P76
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I. Basic Information for CVE-2021-34566

Vulnerability Information
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Vulnerability Title
WAGO I/O-Check Service prone to Memory Overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash the iocheck process and write memory resulting in loss of integrity and DoS.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
WAGO 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAGO是德国万可（WAGO）公司的一款750-88x系列可编程逻辑控制器。该设备专门为在工业环境下应用而设计的数字运算操作电子系统。 WAGO I/O-Check Service存在安全漏洞，该漏洞源于未经身份验证的远程攻击者可以发送包含操作系统命令的特制数据包，使iocheck进程崩溃并写入内存，从而导致完整性丧失和DoS。
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

VendorProductAffected VersionsCPESubscribe
WAGO750-81xx/xxx-xxxFW FW1 ~ FW18 Patch 2 -
WAGO750-82xx/xxx-xxx FW1 ~ FW18 Patch 2 -
WAGO752-8303/8000-0002 FW1 ~ FW18 Patch 2 -
WAGO762-4xxx FW1 ~ FW18 Patch 2 -
WAGO762-5xxx FW1 ~ FW18 Patch 2 -
WAGO762-6xxx FW1 ~ FW18 Patch 2 -

II. Public POCs for CVE-2021-34566

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III. Intelligence Information for CVE-2021-34566

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Same Patch Batch · WAGO · 2022-11-09 · 4 CVEs total

CVE-2021-345699.8 CRITICALWAGO I/O-Check Service prone to Out-of-bounds Write
CVE-2021-345678.2 HIGHWAGO I/O-Check Service prone to Out-of-bounds Read
CVE-2021-345687.5 HIGHWAGO I/O-Check Service prone to Allocation of Resources Without Limits or Throttling

IV. Related Vulnerabilities

Same product: 750-81xx/xxx-xxxFW
Same vendor: WAGO
Same weakness: CWE-120

V. Comments for CVE-2021-34566

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