Vulnerability identifier: #VU54187

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32978

CWE-ID: CWE-256

Exploitation vector: Network

Exploit availability: No

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

Vendor:

Description

The vulnerability allows a remote attacker  to gain access to other users' credentials.

The vulnerability exists due to the programming protocol allows for a previously entered password and lock state to be read by an attacker. A remote attacker can use the password to unlock the PLC.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://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.