Cyber Resilience

CVE-2025-27393

HighRCE

Published: 11 March 2025

Published
11 March 2025
Modified
22 August 2025
KEV Added
—
Patch
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CVSS Score v4 8.6 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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
EPSS Score 0.0311 87.1th percentile
Risk Priority 19 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 8.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 12.9% 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).

Deeper analysis

The vulnerability CVE-2025-27393 affects Siemens SCALANCE LPE9403 devices (part number 6GK5998-3GS00-2AC2) running all versions prior to V4.0. It arises from insufficient sanitization of user input when new users are created and is tracked as CWE-78, allowing command injection on the device.

An authenticated remote attacker possessing high privileges can exploit the flaw over the network to execute arbitrary code, resulting in full control over the device's confidentiality, integrity, and availability.

The official Siemens advisory SSA-075201 addresses the issue and outlines mitigation steps for affected deployments.

EPSS values have remained low, with a recorded peak of 0.0440 and a current score of 0.0311.

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-78

Related Threats

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

CVEs Like This One

CVE-2025-27392Same product: Siemens Scalance Lpe9403
CVE-2025-27394Same product: Siemens Scalance Lpe9403
CVE-2025-27395Same product: Siemens Scalance Lpe9403
CVE-2025-27396Same product: Siemens Scalance Lpe9403
CVE-2026-42454Shared CWE-78
CVE-2026-34796Shared CWE-78
CVE-2024-57016Shared CWE-78
CVE-2025-50475Shared CWE-78
CVE-2024-57015Shared CWE-78
CVE-2026-36828Shared CWE-78

Affected Assets

siemens
scalance lpe9403 firmware
≤ 4.0

Mitigating Controls

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.

References