Critical – 9.4
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

PT-2025-83: Improper permission assignment to a critical resource in Fastwel PLC web server

Error type:

  • CWE-732:Incorrect Permission Assignment for Critical Resource

Vulnerability vector:

  • Base vulnerability score (CVSSv4.0): CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  • Severity (CVSSv4.0): 9.4 (Critical)

Description:

The vulnerability was identified in Fastwel programmable controllers, versions 3.4.5.0 (CPM810-03), 3.4.9.1 (СPM723-01).

Exploitation of the vulnerability allows an attacker with administrative permissions in a restricted environment to execute arbitrary code in the operating system and escalate their privileges to superuser by modifying critical service files.

Vulnerability status: Confirmed by vendor

Date of vulnerability remediation: 10.09.2025

Recommendations:

Update to versions:

  • CPM723-01 3.4.9.5
  • CPM810-03 3.4.5.1

Additional information: 

Researcher: Maksim Gruzin (Positive Technologies)

Identifiers:

BDU:2025-11166

Vendor:

Fastwel

Vulnerable product:

CPM810-03, СPM723-01

Vulnerable versions:

3.4.5.0 (CPM810-03), 3.4.9.1 (СPM723-01)