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CVE-2021-20998— WAGO: Managed Switches: Unauthorized creation of user accounts

Quick assessment

Affected
WAGO 0852-0303
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 存在安全漏洞。攻击者可以使用特制的数据包创建用户。

CVSS 10.0 · Critical EPSS 1.11% · P66

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account
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I. Basic Information for CVE-2021-20998

Vulnerability Information
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Vulnerability Title
WAGO: Managed Switches: Unauthorized creation of user accounts
Source: CVE Program / CVE List V5
Vulnerability Description
In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WAGO 访问控制错误漏洞
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 存在安全漏洞。攻击者可以使用特制的数据包创建用户。
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 0852-0303 unspecified ~ V1.2.3.S0 -
WAGO 0852-1305 unspecified ~ V1.1.7.S0 -
WAGO 0852-1505 unspecified ~ V1.1.6.S0 -
WAGO 0852-1305/000-001 unspecified ~ V1.0.4.S0 -
WAGO 0852-1505/000-001 unspecified ~ V1.0.4.S0 -

II. Public POCs for CVE-2021-20998

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III. Intelligence Information for CVE-2021-20998

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Other References for CVE-2021-20998 (1)

Same Patch Batch · WAGO · 2021-05-13 · 6 CVEs total

CVE-2021-20994 8.8 HIGH WAGO: Managed Switches: Reflected Cross-site Scripting
CVE-2021-20997 7.5 HIGH WAGO: Managed Switches: Unauthorized access to password hashes
CVE-2021-20993 5.3 MEDIUM WAGO: Managed Switches: Exposure of sensitive information through directory listing
CVE-2021-20995 5.3 MEDIUM WAGO: Managed Switches: Storage of user credentials in a cookie
CVE-2021-20996 5.3 MEDIUM WAGO: Managed Switches: Unsecure Cookie settings

IV. Related Vulnerabilities

Same product: 0852-0303
Same vendor: WAGO
Same weakness: CWE-306

V. Comments for CVE-2021-20998

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