CVE-2026-21718

CRITICAL
2026-02-27 [email protected]
10.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 27, 2026 - 01:16 nvd
CRITICAL 10.0

Tags

Authentication Bypass Xweb 500d Pro Firmware Xweb 300d Pro Firmware Xweb 500b Pro Firmware

Description

An authentication bypass vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, enabling any attackers to bypass the authentication requirement and achieve pre-authenticated code execution on the system.

Analysis

Authentication bypass in Copeland XWEB Pro HVAC controller version 1.12.1 and prior due to weak cryptographic algorithm. CVSS 10.0 — any unauthenticated attacker can gain full system access to building automation controllers.

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Remediation

Within 24 hours: Identify all systems running Copeland XWEB Pro v1.12.1 or earlier and isolate them from production networks if possible. Immediately implement network-based access controls to restrict connectivity to these systems. …

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Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +50
POC: 0

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CVE-2026-21718 vulnerability details – vuln.today
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