What is the CVSS score of CVE-2026-22553?

CVE-2026-22553 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: 1.3%.

How to fix or mitigate CVE-2026-22553?

Within 24 hours: Identify all instances of InSAT MasterSCADA BUK-TS in your environment and assess their exposure to untrusted networks. Within 7 days: Implement network segmentation to restrict access to the MMadmServ interface and deploy WAF rules to block malicious payloads targeting the vulnerable endpoint. Within 30 days: Contact the vendor for patch availability and timeline; evaluate alternative SCADA solutions if patches remain unavailable, and conduct vulnerability scanning of affected systems.

Masterscada CVE-2026-22553

CRITICAL

OS Command Injection (CWE-78)

2026-02-24 ics-cert@hq.dhs.gov

RCE Command Injection SCADA Masterscada

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Access MMadmServ web interface
Exploit

Inject OS commands in vulnerable field
Execution

Execute arbitrary system commands
Impact

Achieve remote code execution

Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques across 1 tactic: Execution 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	MMadmServ web interface of InSAT MasterSCADA BUK-TS must be accessible and exposed to network. No authentication required. Vulnerable input field in MMadmServ accepts unsanitized OS command injection payloads.
Impact	CVSS 9.8, EPSS 1.26%. Command injection on SCADA management server — full compromise of industrial monitoring.
Exploit ScenarioDerived	Attacker injects OS commands through the MMadmServ interface, gaining shell access to the SCADA server, potentially manipulating process monitoring.

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

No patch listed yet 1.3% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 12, 2026

OS command injection in InSAT MasterSCADA BUK-TS through MMadmServ web interface. Unauthenticated RCE on SCADA management server. EPSS 1.26%.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Command injection RCE in MasterSCADA management server.

RemediationAI

Apply vendor patch. Never expose SCADA management to untrusted networks.

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-78 in MMadmServ web interface. Combined with SQLi (CVE-2026-21410), provides multiple attack vectors against the SCADA system.

Know when Masterscada gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

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

All versions of InSAT MasterSCADA BUK-TS are susceptible to OS command injection through a field in its MMadmServ web interface. Malicious users that use the vulnerable endpoint are potentially able to cause remote code execution.

Executive ViewAI

Why It Matters

InSAT MasterSCADA BUK-TS contains a critical remote code execution vulnerability (CVSS 9.8) affecting all versions with no available patch. An attacker can execute arbitrary OS commands through the MMadmServ web interface, potentially compromising operational technology systems and critical infrastructure that depend on this software.

Business Impact: Severe

Compensating Controls

Implement network segmentation to restrict MMadmServ web interface access to trusted administrative networks only. Deploy Web Application Firewall (WAF) with rules to filter OS command injection patterns (backticks, $(), pipes, semicolons) in the vulnerable endpoint. Disable or restrict the vulnerable endpoint if operationally feasible. Enforce multi-factor authentication and API rate limiting on the web interface. Monitor and log all access to MMadmServ. Contact InSAT vendor immediately regarding patch availability and timeline.

Threat Intelligence Overview

EPSS Score

1.3%

Top 21% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

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 1.3%

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.