What is the CVSS score of CVE-2026-24663?

CVE-2026-24663 has a CVSS 3.1 base score of 9.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 1.0%.

How to fix or mitigate CVE-2026-24663?

Within 24 hours: Identify all systems running XWEB Pro 1.12.1 or earlier and isolate them from production networks if possible; enable enhanced logging on affected systems. Within 7 days: Deploy WAF rules to block malicious requests to the libraries installation route; implement network segmentation to restrict access to XWEB Pro from trusted networks only. Within 30 days: Upgrade to a patched version if released; if no patch is available, evaluate alternative solutions or schedule controlled decommissioning of affected systems.

Xweb 300d Pro Firmware CVE-2026-24663

CRITICAL

OS Command Injection (CWE-78)

2026-02-27 ics-cert@hq.dhs.gov

Command Injection Xweb 300d Pro Firmware Xweb 500b Pro Firmware Xweb 500d Pro Firmware Copeland

9.0

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Send crafted request to libraries installation route
Exploit

Inject OS command into request body
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	XWEB Pro version 1.12.1 or prior with libraries installation route exposed and accepting unauthenticated requests. No authentication required. Attacker must craft request body with specific OS command injection payload syntax compatible with target system shell.
Impact	CVSS 9.0, EPSS 0.96%. When chained with the auth bypass (CVE-2026-21718), enables complete takeover of HVAC control systems.
Exploit ScenarioDerived	Attacker chains auth bypass with command injection to execute arbitrary commands on the XWEB Pro controller, potentially disrupting building climate control or using the device as a pivot point.

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

No patch listed yet 1.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Unauthenticated OS command injection in Copeland XWEB Pro HVAC controller version 1.12.1 and prior. EPSS 0.96% indicates real exploitation risk for internet-exposed building automation systems.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.0

Command injection in Copeland XWEB Pro HVAC controller.

RemediationAI

Update firmware immediately. Isolate building automation controllers from IT networks and the internet.

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 OS command injection exploitable without authentication. Combined with CVE-2026-21718 auth bypass, provides full unauthenticated RCE on building automation controllers.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.0 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an unauthenticated attacker to achieve remote code execution on the system by sending a crafted request to the libraries installation route and injecting malicious input into the request body.

Executive ViewAI

Why It Matters

A critical remote code execution vulnerability in XWEB Pro 1.12.1 and earlier allows unauthenticated attackers to gain complete system control through a single malicious request. Any organization running affected versions is at immediate risk of data breach, system compromise, and operational disruption, with no vendor patch currently available.

Business Impact: Severe

Compensating Controls

Implement Web Application Firewall (WAF) rules to block requests containing command injection payloads to the libraries installation endpoint; restrict network access to the XWEB Pro service using firewall rules and network segmentation; disable the libraries installation feature if operationally feasible; require multi-factor authentication for any administrative access; implement continuous monitoring and alerting for suspicious activity targeting this service; consider air-gapping or removing affected systems pending vendor patch availability.

Threat Intelligence Overview

EPSS Score

1.0%

Top 24% 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 1.0%

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

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +45

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

OS Command Injection CRITICAL

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

Affected Products (CPE)CVE.org

cpe:2.3:o:copeland:xweb_500b_pro_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:copeland:xweb_300d_pro_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:copeland:xweb_500d_pro_firmware:*:*:*:*:*:*:*:*

More in Xweb 300d Pro Firmware

View all

CVE-2026-21718 CRITICAL Act Now

10.0 Feb 27

Authentication bypass in Copeland XWEB Pro HVAC controller version 1.12.1 and prior due to weak cryptographic algorithm.

CVE-2026-25085 HIGH This Week

8.6 Feb 27

Copeland XWEB Pro firmware versions 1.12.1 and earlier suffer from an authentication bypass vulnerability where malforme

CVE-2026-24517 HIGH This Week

8.0 Feb 27

Remote code execution in Xweb 300d/500b/500d Pro firmware versions 1.12.1 and earlier allows authenticated attackers to

CVE-2026-25195 HIGH This Week

8.0 Feb 27

Remote code execution in XWEB Pro firmware versions 1.12.1 and earlier allows authenticated attackers to execute arbitra

CVE-2026-25111 HIGH This Week

8.0 Feb 27

Remote code execution in XWEB Pro versions 1.12.1 and earlier allows authenticated attackers to execute arbitrary OS com

CVE-2026-25109 HIGH This Week

8.0 Feb 27

Remote code execution in Xweb 300d Pro, 500d Pro, and 500b Pro firmware versions 1.12.1 and earlier allows authenticated

CVE-2026-24695 HIGH This Week

8.0 Feb 27

Remote code execution in XWEB Pro firmware versions 1.12.1 and earlier allows authenticated attackers to execute arbitra

CVE-2026-24689 HIGH This Week

8.0 Feb 27

Remote code execution in XWEB Pro firmware (versions 1.12.1 and earlier) allows authenticated attackers to execute arbit

CVE-2026-21389 HIGH This Week

8.0 Feb 27

Remote code execution in XWEB Pro firmware (versions 1.12.1 and earlier) allows authenticated attackers to execute arbit

CVE-2026-20910 HIGH This Week

8.0 Feb 27

Remote code execution in XWEB Pro firmware versions 1.12.1 and earlier allows authenticated attackers to execute arbitra

CVE-2026-20902 HIGH This Week

8.0 Feb 27

Remote code execution in Xweb 300d Pro, 500b Pro, and 500d Pro firmware (version 1.12.1 and prior) allows authenticated

CVE-2026-20742 HIGH This Week

8.0 Feb 27

Remote code execution in XWEB Pro firmware versions 1.12.1 and earlier allows authenticated attackers to execute arbitra

Same weakness CWE-78 – OS Command Injection

View all

CVE-2019-15107 CRITICAL POC

9.8

CVE-2024-51378 CRITICAL POC

9.8

CVE-2014-6271 CRITICAL POC

9.8

CVE-2018-11138 CRITICAL POC

9.8

CVE-2014-6278 HIGH POC

8.8

CVE-2020-9054 CRITICAL POC

9.8

CVE-2017-6334 HIGH POC

8.8

CVE-2024-50603 CRITICAL POC

10.0

Same technique Command Injection

View all

CVE-2024-21887 CRITICAL POC

9.1

CVE-2016-3081 HIGH POC

8.1

CVE-2012-1823 CRITICAL POC

9.8

CVE-2016-1555 CRITICAL POC

9.8

CVE-2024-55956 CRITICAL POC

9.8

References

Advisories & patches

REF https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-10.json REF https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate REF https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10

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