Description
The use of a hard-coded cryptographic key was discovered in firmware version 3.60 of the Click Plus PLC. The vulnerability relies on the fact that the software contains a hard-coded AES key used to protect the initial messages of a new KOPS session.
Scores
CVSS v3
5.3
EPSS
0.0004
EPSS Percentile
11.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-321
Status
published
Products (3)
AutomationDirect/CLICK PLUS C0-0x CPU firmware
< v3.71
AutomationDirect/CLICK PLUS C0-1x CPU firmware
< v3.71
AutomationDirect/CLICK PLUS C2-x CPU firmware
< v3.71
Published
Sep 23, 2025
Tracked Since
Feb 18, 2026