What is the CVSS score of CVE-2026-3630?

CVE-2026-3630 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: 0.0%.

How to fix or mitigate CVE-2026-3630?

Within 24 hours: Identify all systems running COMMGR2 and isolate them from production networks if possible; disable remote access and restrict local access to authorized personnel only. Within 7 days: Implement network segmentation to limit COMMGR2 lateral movement; deploy enhanced monitoring and logging on affected systems; coordinate with Delta Electronics for patch timeline and interim guidance. Within 30 days: Develop and test a migration or upgrade plan; apply vendor patch immediately upon release or implement approved compensating controls; conduct security assessment post-remediation.

Commgr2 CVE-2026-3630

CRITICAL

Out-of-bounds Write (CWE-787)

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

Buffer Overflow Industrial Stack Overflow Commgr2 Deltaww

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Send malicious network packet
Exploit

Overflow stack buffer in COMMGR2 parser
Execution

Overwrite return address
Impact

Execute arbitrary code with service privileges

Vulnerability Assessment

Weakness	CWE CWE-787 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, write limits MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege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
Exploitation Conditions	No special conditions — remote unauthenticated exploitation against default Delta Electronics COMMGR2 configurations listening on network interface.
Impact	CVSS 9.8. ICS communication gateway — compromise enables manipulation of industrial communications.
Exploit ScenarioDerived	Attacker sends oversized input to COMMGR2, overflows stack buffer, executes code on the industrial communication gateway.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Stack-based buffer overflow in Delta Electronics COMMGR2 communication management software. ICS vulnerability enabling remote code execution on industrial communication gateways.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:56 CVSS 9.8

Stack overflow in Delta Electronics COMMGR2.

RemediationAI

Apply Delta Electronics security patch. Isolate ICS communication systems.

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

CWE-787 in industrial communication management software. Delta Electronics products are widely used in manufacturing and building automation.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

High

Integrity

High

Availability

High

DescriptionCVE.org

Delta Electronics COMMGR2 has

Stack-based Buffer Overflow vulnerability.

Executive ViewAI

Why It Matters

A critical stack-based buffer overflow vulnerability (CVE-2026-3630, CVSS 9.8) affects Delta Electronics COMMGR2 with no available patch, enabling remote code execution and complete system compromise. Organizations running this software face immediate risk of data breach, operational disruption, and potential lateral movement across connected infrastructure.

Business Impact: Severe

Compensating Controls

Network segmentation isolating COMMGR2 from critical systems; disable unnecessary network services and remote access features; implement strict firewall rules limiting inbound/outbound traffic; deploy IDS/IPS signatures to detect exploitation attempts; run COMMGR2 with least privilege; monitor process memory and stack behavior for anomalies; establish 24/7 security monitoring of affected systems. Request Delta Electronics for hotfix or emergency patch availability.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% 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 CRITICAL

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

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

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

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.

Stack-based Buffer Overflow HIGH

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.