What is the CVSS score of CVE-2026-3631?

CVE-2026-3631 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-3631?

Within 24 hours: Identify all systems running Delta Electronics COMMGR2 and document their criticality and network exposure. Within 7 days: Implement network segmentation to restrict access to COMMGR2 systems to authorized users only and enable enhanced monitoring for suspicious traffic patterns. Within 30 days: Contact Delta Electronics for patch availability timelines and establish a plan for expedited deployment once released; evaluate alternative solutions if no patch roadmap is provided.

Commgr2 CVE-2026-3631

HIGH

Out-of-bounds Read (CWE-125)

2026-03-09 759f5e80-c8e1-4224-bead-956d7b33c98b

Buffer Overflow Denial Of Service Industrial Commgr2 Deltaww

7.5

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Send crafted network packet
Exploit

Trigger buffer over-read in COMMGR2 parser
Impact

Cause denial of service crash

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Weakness	CWE CWE-125 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, read limits MITRE ATT&CK 1 technique across 1 tactic: Collection The technique list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	No special conditions — remote unauthenticated exploitation against default Delta Electronics COMMGR2 configurations listening on network interface.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

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

Delta Electronics COMMGR2 has

Buffer Over-read DoS vulnerability. [CVSS 7.5 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

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 Commgr2. Delta Electronics COMMGR2 has

Buffer Over-read DoS vulnerability.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionCVE.org

Delta Electronics COMMGR2 has

Buffer Over-read DoS vulnerability.

Executive ViewAI

Why It Matters

Delta Electronics COMMGR2 contains a buffer over-read vulnerability that could allow attackers to cause service disruptions through denial-of-service attacks. Organizations using this component in critical infrastructure or operational technology environments face potential downtime and operational interruption until a patch becomes available.

Business Impact: High

Compensating Controls

Implement network segmentation to isolate COMMGR2 systems; deploy intrusion detection/prevention systems (IDS/IPS) with rules monitoring for buffer over-read attack patterns; restrict network access via firewall rules to only necessary connections; implement rate limiting on COMMGR2 interfaces; establish continuous monitoring and alerting for service availability; maintain documented procedures for rapid system restart if DoS occurs.

Threat Intelligence Overview

EPSS Score

0.0%

Top 87% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

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 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

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

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.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.