#VU54185 Improper Authentication in CLICK PLC CPU Module C0-1x CPUs - CVE-2021-32986

Vulnerability identifier: #VU54185

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-32986

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
CLICK PLC CPU Module C0-1x CPUs
Hardware solutions / Firmware

Vendor: AutomationDirect

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to after the PLC is unlocked by an authorized user, the unlocked state does not timeout. A remote attacker can gain access to target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

CLICK PLC CPU Module C0-1x CPUs: before 3.00

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External links
https://ics-cert.us-cert.gov/advisories/icsa-21-166-02

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.