What is the CVSS score of CVE-2026-25655?

CVE-2026-25655 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-25655?

Within 24 hours: Identify all SINEC NMS instances in your environment and document their versions and deployment scope; implement strict access controls limiting user privileges to read-only where feasible. Within 7 days: Enable comprehensive audit logging on all SINEC NMS configuration file access and modifications; conduct a review of recent configuration changes for unauthorized alterations. Within 30 days: Upgrade all affected SINEC NMS instances to version V4.0 SP2 or later once available; if upgrade is not immediately feasible, implement network segmentation to restrict access to SINEC NMS systems to authorized administrators only.

Sinec Nms CVE-2026-25655

HIGH

Uncontrolled Search Path Element (CWE-427)

2026-02-10 productcert@siemens.com

Privilege Escalation RCE Siemens Sinec Nms

7.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Low-privileged user logs into SINEC NMS
Delivery

Modify configuration file permissions
Exploit

Inject malicious DLL path
Execution

Application loads DLL at startup
Impact

Execute arbitrary code as administrator

Vulnerability Assessment

Weakness	CWE CWE-427 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V13 - Configuration Search path element control
Exploitation Conditions	Low-privileged user account access to SINEC NMS systems running versions prior to V4.0 SP2 with writable configuration file access; local system access required.
Impact	CVSS 7.8 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None. Exploitation requires authentication.
Exploit ScenarioDerived	An attacker (requires authentication) could exploit this vulnerability to load malicious DLLs, potentially leading to arbitrary code execution with admini.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Arbitrary code execution in Siemens SINEC NMS versions prior to V4.0 SP2 can be achieved when a low-privileged user modifies configuration files to load malicious DLLs, resulting in administrative privilege execution. This local vulnerability affects all current deployments and currently has no available patch. An authenticated attacker with local access can exploit this to gain full system compromise.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:02 CVSS 7.8

A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP2). The affected application permits improper modification of a configuration file by a low-privileged user. [CVSS 7.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch.

Affects your stack

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Technical ContextAI · show details

Classified as CWE-427 (Uncontrolled Search Path Element). Affects Sinec Nms. A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP2). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with administrative privilege.(ZDI-CAN-28107)

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP2). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with administrative privilege.(ZDI-CAN-28107)

Zero Day Initiative Advisories

ZDI-26-131 Siemens SINEC NMS Uncontrolled Search Path Element Local Privilege Escalation Vulnerability Feb 2026

Executive ViewAI

Why It Matters

A HIGH severity vulnerability in SINEC NMS allows low-privileged users to improperly modify critical configuration files, potentially enabling unauthorized system changes, data manipulation, or service disruption. Organizations running SINEC NMS versions prior to V4.0 SP2 face immediate risk of configuration tampering without administrative oversight, particularly in industrial and operational technology environments where such systems are often business-critical.

Business Impact: High

Compensating Controls

Implement strict file-level access controls and permissions on SINEC NMS configuration directories, restricting write access to administrator accounts only; enable comprehensive audit logging and real-time alerting on configuration file modifications; deploy network segmentation to limit SINEC NMS access to trusted administrative networks; disable non-essential SINEC NMS features or modules if business operations permit; monitor user privilege escalation attempts and enforce principle of least privilege across all system accounts.

Threat Intelligence Overview

EPSS Score

0.0%

Top 100% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.