What is the CVSS score of EUVD-2025-200261?

EUVD-2025-200261 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for EUVD-2025-200261?

Yes, a public proof-of-concept exploit is available for EUVD-2025-200261. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate EUVD-2025-200261?

Within 24 hours: Inventory all affected nShield HSM models (Connect XC, 5c, HSMi through versions 13.6.11 or 13.7) and assess physical access controls to equipment locations. Within 7 days: Implement enhanced physical security measures including surveillance, access logs, and tamper detection monitoring; contact Entrust for patch availability and timeline. Within 30 days: Develop and execute a remediation plan including hardware replacement or relocation to physically secured facilities with restricted access protocols.

Nshield 5c Firmware EUVD-2025-200261

| CVE-2025-59693 CRITICAL

Improper Privilege Management (CWE-269)

2025-12-02 cve@mitre.org

Privilege Escalation Nshield 5c Firmware Nshield Connect Xc Base Firmware Nshield Connect Xc High Firmware Nshield Connect Xc Mid Firmware Nshield Hsmi Firmware Entrust

9.8

CVSS 3.1 · Vendor: mitre

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Vulnerability Assessment

Weakness	CWE CWE-269 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V8 - Authorization Least privilege enforcement MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	An attacker with limited access can gain administrative or root privileges, enabling full control over the affected system. With a CVSS score of 9.8 (CRITICAL), this represents a critical risk.
Exploit ScenarioDerived	A local attacker exploits a vulnerability in a privileged service or misconfigured permissions to escalate from a standard user to root/administrator.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 15, 2026

The Chassis Management Board in Entrust nShield Connect XC, nShield 5c, and nShield HSMi through 13.6.11, or 13.7, allows a physically proximate attacker to obtain debug access and escalate privileges by bypassing the tamper label and opening the chassis without leaving evidence, and accessing the JTAG connector. This is called F02.

Earlier versions of this analysis (1)

v1 Mar 15, 2026 - 14:04 CVSS 9.8

RemediationAI

Apply the principle of least privilege. Keep systems patched. Monitor for suspicious privilege changes. Use mandatory access controls (SELinux, AppArmor).

Affected VersionsENISA

n/a n/a

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

Privilege escalation allows a low-privileged user or process to gain elevated permissions beyond what was originally authorized. This vulnerability is classified as Improper Privilege Management (CWE-269).

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (mitre) PRIMARY 9.8 CRITICAL

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

Primary rating from Vendor (mitre) · only source for this CVE.

CVSS VectorVendor: mitre

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Dec 15, 2025 - 13:41 vuln.today

Public exploit code

CVE Published

Dec 02, 2025 - 15:15 nvd

CRITICAL 9.8

Executive ViewAI

Why It Matters

Entrust nShield hardware security modules (HSMs) contain a critical vulnerability allowing physically proximate attackers to bypass security controls and gain administrative access without detection. Organizations using affected HSM models for cryptographic key management face potential compromise of their most sensitive cryptographic assets and encrypted data.

Business Impact: Severe

Compensating Controls

No patch currently available. Implement compensating controls: (1) Restrict physical access to HSM devices through locked cages, server rooms, and biometric controls with audit logging; (2) Deploy continuous tamper monitoring and alerting systems; (3) Implement environmental sensors (intrusion detection) around HSM locations; (4) Establish regular visual inspections and documentation of chassis integrity; (5) Consider key rotation and re-encryption of sensitive data using alternative HSM devices in secure locations; (6) Monitor Entrust security advisories for patch release and schedule immediate deployment upon availability.

Threat Intelligence Overview

EPSS Score

0.1%

Top 80% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

GitHub

VulDB

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 CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

CRITICAL severity + public POC available

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

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: +20

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.