---
id: CVE-2025-11781
title: Use of hardcoded cryptographic keys in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2
summary: >-
  Use of hardcoded cryptographic keys in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2.
  The affected firmware contains a hardcoded static authentication key. An
  attacker with local access to the device can extract this key (e.g., by
  analysing the …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-321
vendor: circutor
product: sge-plc1000_firmware
affected:
  - sge-plc1000_firmware = 9.0.2
  - sge-plc50_firmware = 9.0.2
published: '2025-12-02'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-11781'
references:
  - url: >-
      https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-circutor-products-0
    label: cve-coordination@incibe.es
tags:
  - nvd
epss: 0.00138
epssPercentile: 0.02575
ingestedAt: '2026-09-26T00:22:39.999Z'
---

## Overview

Use of hardcoded cryptographic keys in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. The affected firmware contains a hardcoded static authentication key. An attacker with local access to the device can extract this key (e.g., by analysing the firmware image or memory dump) and create valid firmware update packages. This bypasses all intended access controls and grants full administrative privileges.

## Affected

- `sge-plc1000_firmware = 9.0.2`
- `sge-plc50_firmware = 9.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.