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CVE-2025-55069: AutomationDirect CLICK PLUS Predictable Seed in Pseudo-Random Number Generator

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-23 · updated 2026-10-18
• Weakness: CWE-337

Description

A predictable seed in pseudo-random number generator vulnerability has been discovered in firmware version 3.60 of the Click Plus PLC. The vulnerability relies on the fact that the software implements a predictable seed for its pseudo-random number generator, which compromises the security of the generated private keys.

Affected products

• AutomationDirect CLICK PLUS C0-0x CPU firmware: before v3.71 — fixed in v3.71
• AutomationDirect CLICK PLUS C0-1x CPU firmware: before v3.71 — fixed in v3.71
• AutomationDirect CLICK PLUS C2-x CPU firmware: before v3.71 — fixed in v3.71

How to fix

Upgrade to a fixed version: 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. Check the vendor advisory for mitigations.

References

• https://www.automationdirect.com/support/software-downloads
• https://www.cisa.gov/news-events/ics-advisories/icsa-25-266-01

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