What is the CVSS score of CVE-2026-23720?

CVE-2026-23720 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-23720?

Within 24 hours: Identify all systems running Simcenter Femap or Nastran versions prior to V2512 and restrict file import capabilities where possible. Within 7 days: Implement network controls to limit NDB file processing to trusted sources only and disable automatic file opening features. Within 30 days: Plan immediate upgrade to V2512 or later once patch becomes available, and establish file validation procedures before processing any NDB files.

Simcenter Femap CVE-2026-23720

Q: Which versions of Simcenter Femap are affected by CVE-2026-23720?

Simcenter Femap and Nastran users face a high-severity vulnerability (CVSS 7.8) that could allow attackers to crash applications or potentially execute code by submitting malicious NDB files.

HIGH

Out-of-bounds Read (CWE-125)

2026-02-10 productcert@siemens.com

Buffer Overflow Information Disclosure Siemens Simcenter Femap Simcenter Nastran

7.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Craft malicious NDB file
Delivery

Distribute via email or file sharing
Exploit

User opens file in Femap/Nastran
Execution

Out-of-bounds read in parser
Impact

Execute arbitrary code

Vulnerability Assessment

Weakness	CWE CWE-125 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, read limits MITRE ATT&CK 1 technique across 1 tactic: Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	User interaction required: victim must open a specially crafted NDB (Nastran Database) file in Simcenter Femap or Simcenter Nastran versions earlier than V2512. Local file access is required. No network-based exploitation possible.
Impact	CVSS 7.8 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: None. User interaction: Required.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to execute code in the context of the current process.

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

Code execution in Simcenter Femap and Nastran versions prior to V2512 results from an out-of-bounds read flaw triggered when parsing malicious NDB files. A local attacker with user interaction can exploit this vulnerability to execute arbitrary code with the privileges of the affected application. No patch is currently available for this vulnerability.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:02 CVSS 7.8

A vulnerability has been identified in Simcenter Femap (All versions < V2512), Simcenter Nastran (All versions < V2512). The affected applications contains an out of bounds read vulnerability while parsing specially crafted NDB files. [CVSS 7.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-125 (Out-of-bounds Read). Affects Simcenter Femap. A vulnerability has been identified in Simcenter Femap (All versions < V2512), Simcenter Nastran (All versions < V2512). The affected applications contains an out of bounds read vulnerability while parsing specially crafted NDB files. This could allow an attacker to execute code in the context of the current process.

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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:N/UI:R/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

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

Executive ViewAI

Why It Matters

Simcenter Femap and Nastran users face a high-severity vulnerability (CVSS 7.8) that could allow attackers to crash applications or potentially execute code by submitting malicious NDB files. Organizations using these engineering simulation tools for design and analysis are at risk, particularly those accepting files from external sources or untrusted networks.

Business Impact: High

Compensating Controls

Restrict NDB file imports to known, trusted sources only; disable automatic file opening and processing features; implement network segmentation to isolate affected systems; require manual review and validation of all NDB files before processing; monitor for suspicious file submissions; consider disabling Simcenter features that process NDB files until patching is possible.

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

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.