Critical9.4
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

PT-2025-81: OS command injection in Fastwel PLC web server

Error type:

  • CWE-78:Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Vulnerability vector:

  • Base vulnerability score (CVSSv4.0): CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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).

The discovered vulnerability is related to a failure to neutralize special elements used in operating system commands. Exploitation of this vulnerability allows a remote attacker to execute arbitrary operating system commands and escalate their privileges to superuser by sending a specially crafted POST request.

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, Kostantin Maksimov (Positive Technologies)

Identifiers:

BDU:2025-11164

Vendor:

Fastwel

Vulnerable product:

CPM810-03, СPM723-01

Vulnerable versions:

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