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CVE-2021-21000— WAGO: PFC200 Denial of Service due to the number of connections to the runtime

Quick assessment

Affected
WAGO Series PFC200 Controller
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）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 PFC200设备存在安全漏洞，该漏洞源于对设备进行网络访问的攻击者可利用该漏洞可能会对运行时的登录服务造成拒绝服务。

CVSS 5.3 · Medium EPSS 1.04% · P61

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-21000

Vulnerability Information
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Vulnerability Title
WAGO: PFC200 Denial of Service due to the number of connections to the runtime
Source: CVE Program / CVE List V5
Vulnerability Description
On WAGO PFC200 devices in different firmware versions with special crafted packets an attacker with network access to the device could cause a denial of service for the login service of the runtime.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
WAGO 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAGO是德国万可（WAGO）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 PFC200设备存在安全漏洞，该漏洞源于对设备进行网络访问的攻击者可利用该漏洞可能会对运行时的登录服务造成拒绝服务。
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 Series PFC200 Controller 750-823 ~ FW07 -
WAGO Series Ethernet Controller 750-8202/xxx-xxx ~ 03.06.19 (18) -

II. Public POCs for CVE-2021-21000

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III. Intelligence Information for CVE-2021-21000

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Other References for CVE-2021-21000 (1)

IV. Related Vulnerabilities

Same product: Series PFC200 Controller
Same vendor: WAGO
Same weakness: CWE-770

V. Comments for CVE-2021-21000

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