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CVE-2021-34569— WAGO I/O-Check Service prone to Out-of-bounds Write

Quick assessment

Affected
WAGO 750-81xx/xxx-xxxFW
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.

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存在缓冲区错误漏洞，该漏洞源于攻击者可以发送包含操作系统命令的特制数据包，以使诊断工具崩溃并写入内存。

CVSS 9.8 · Critical EPSS 0.87% · P59

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-34569

Vulnerability Information
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Vulnerability Title
WAGO I/O-Check Service prone to Out-of-bounds Write
Source: CVE Program / CVE List V5
Vulnerability Description
In WAGO I/O-Check Service in multiple products an attacker can send a specially crafted packet containing OS commands to crash the diagnostic tool and write memory.
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
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
WAGO 缓冲区错误漏洞
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存在缓冲区错误漏洞，该漏洞源于攻击者可以发送包含操作系统命令的特制数据包，以使诊断工具崩溃并写入内存。
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
WAGO 750-81xx/xxx-xxxFW FW1 ~ FW18 Patch 2 -
WAGO 750-82xx/xxx-xxx FW1 ~ FW18 Patch 2 -
WAGO 752-8303/8000-0002 FW1 ~ FW18 Patch 2 -
WAGO 762-4xxx FW1 ~ FW18 Patch 2 -
WAGO 762-5xxx FW1 ~ FW18 Patch 2 -
WAGO 762-6xxx FW1 ~ FW18 Patch 2 -

II. Public POCs for CVE-2021-34569

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III. Intelligence Information for CVE-2021-34569

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Other References for CVE-2021-34569 (1)

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

CVE-2021-34566 9.1 CRITICAL WAGO I/O-Check Service prone to Memory Overflow
CVE-2021-34567 8.2 HIGH WAGO I/O-Check Service prone to Out-of-bounds Read
CVE-2021-34568 7.5 HIGH WAGO 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-787