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Fencer Vulns
high 8.3

CVE-2025-55069 json

AutomationDirect CLICK PLUS Predictable Seed in Pseudo-Random Number Generator

published 2025-09-23 13 mo ago modified 2026-10-18 21 d ago also EUVD-2025-30936

cvss
8.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

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.

Patch / fix

  • 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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-25-266-01 updated cvss 8.3

AutomationDirect CLICK PLUS

  • 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
    affected: mitigation “AutomationDirect recommends that users update CLICK PLUS and firmware to V3.80.” automationdirect.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
13 mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CNA 3.1 8.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • AutomationDirect CLICK PLUS C0-0x CPU firmware
  • AutomationDirect CLICK PLUS C0-1x CPU firmware
  • AutomationDirect CLICK PLUS C2-x CPU firmware

Classification

Weakness
  • CWE-337 Predictable Seed in Pseudo-Random Number Generator (PRNG)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.