CVE-2025-27393

HighRCE

Published: 11 March 2025

Published

11 March 2025

Modified

22 August 2025

KEV Added

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Patch

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CVSS Score 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0311 86.9th percentile

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-27393 is a high-severity OS Command Injection (CWE-78) vulnerability in Siemens Scalance Lpe9403 Firmware. Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 13.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly mandates validation and sanitization of user inputs during new user creation to prevent OS command injection exploits.

SI-2 Flaw Remediation good match

prevent

Requires timely identification, reporting, and patching of the input sanitization flaw, aligning with the advisory to update to V4.0 or later.

AC-2 Account Management partial match

prevent

Establishes secure account management procedures for creating users, including controls to mitigate improper input handling risks.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.004 Unix Shell Execution

Adversaries may abuse Unix shell commands and scripts for execution.

attack.mitre.org →

Why these techniques?

OS command injection in network-accessible management interface (user creation) directly enables remote code execution via Unix shell on the device.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

A vulnerability has been identified in SCALANCE LPE9403 (6GK5998-3GS00-2AC2) (All versions < V4.0). Affected devices do not properly sanitize user input when creating new users. This could allow an authenticated highly-privileged remote attacker to execute arbitrary code on the device.

Deeper analysisAI

CVE-2025-27393 affects Siemens SCALANCE LPE9403 (6GK5998-3GS00-2AC2) in all versions prior to V4.0. The vulnerability arises from improper sanitization of user input when creating new users, classified as CWE-78 (OS Command Injection). It carries a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) and was published on 2025-03-11.

An authenticated remote attacker with high privileges can exploit this vulnerability over the network with low attack complexity and no user interaction. Exploitation enables arbitrary code execution on the device, resulting in high impacts to confidentiality, integrity, and availability.

The Siemens security advisory provides mitigation guidance at https://cert-portal.siemens.com/productcert/html/ssa-075201.html. Affected devices should be updated to V4.0 or later to address the issue.