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CVE-2021-32986— Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel

Quick assessment

Affected
Automation Direct CLICK PLC CPU Modules: C0-1x CPUs
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.

CLICK PLC CPU Modules是Automation Direct的网络设备一个 CLICK CPU 模块最多可以连接 8 个 I/O 模块，以扩展系统 I/O 数量并满足特定应用的需要。 Automation Direct CLICK PLC CPU Modules存在安全漏洞，该漏洞源于PLC被授权用户解锁后，解锁状态不超时。

CVSS 9.8 · Critical EPSS 1.11% · P63

Possible ATT&CK Techniques 1 AI

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I. Basic Information for CVE-2021-32986

Vulnerability Information
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Vulnerability Title
Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel
Source: CVE Program / CVE List V5
Vulnerability Description
After Automation Direct CLICK PLC CPU Modules: C0-1x CPUs with firmware prior to v3.00 is unlocked by an authorized user, the unlocked state does not timeout. If the programming software is interrupted, the PLC remains unlocked. All subsequent programming connections are allowed without authorization. The PLC is only relocked by a power cycle, or when the programming software disconnects correctly.
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
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
CLICK PLC CPU Modules 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CLICK PLC CPU Modules是Automation Direct的网络设备一个 CLICK CPU 模块最多可以连接 8 个 I/O 模块，以扩展系统 I/O 数量并满足特定应用的需要。 Automation Direct CLICK PLC CPU Modules存在安全漏洞，该漏洞源于PLC被授权用户解锁后，解锁状态不超时。
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
Automation Direct CLICK PLC CPU Modules: C0-1x CPUs unspecified ~ 3.00 -

II. Public POCs for CVE-2021-32986

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III. Intelligence Information for CVE-2021-32986

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Vendor Advisories for CVE-2021-32986 (1)

Same Patch Batch · Automation Direct · 2022-04-04 · 5 CVEs total

CVE-2021-32980 9.8 CRITICAL Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or C
CVE-2021-32984 9.8 CRITICAL Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or C
CVE-2021-32978 7.5 HIGH Automation Direct CLICK PLC CPU Modules Plaintext Storage of a Password
CVE-2021-32982 7.5 HIGH Automation Direct CLICK PLC CPU Modules Cleartext Transmission of Sensitive Information

IV. Related Vulnerabilities

Same product: CLICK PLC CPU Modules: C0-1x CPUs
Same vendor: Automation Direct
Same weakness: CWE-288

V. Comments for CVE-2021-32986

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