What is the CVSS score of CVE-2026-28252?

CVE-2026-28252 has a CVSS 4.0 base score of 9.2 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-28252?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Monitor vendor channels for patch availability.

Tracer Concierge CVE-2026-28252

CRITICAL

Use of a Broken or Risky Cryptographic Algorithm (CWE-327)

2026-03-12 ics-cert@hq.dhs.gov

Authentication Bypass Tracer Sc Firmware Tracer Concierge Trane

9.2

CVSS 4.0 · NVD

View

Attack ChainAIDerived

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

Access

Identify weak cryptographic algorithm in authentication
Exploit

Craft forged credentials using broken cipher
Execution

Bypass authentication mechanism
Impact

Achieve root-level device access

Vulnerability Assessment

Weakness	CWE CWE-327 OWASP Top 10:2025 A02:2021 - Cryptographic Failures ASVS 5.0 V6 - Stored Cryptography Key management, algorithm strength validation
Exploitation Conditions	Trane Tracer SC, Tracer SC+, or Tracer Concierge devices using the vulnerable cryptographic algorithm for authentication. Attacker requires network access and knowledge of the broken cipher implementation; exploitation attempts may trigger detection mechanisms (AC:H indicates high attack complexity).
Impact	CVSS 9.2 (Critical, CVSS 4.0 scoring). Network vector, high complexity with attack prerequisites. Despite the complexity, the target – building automation systems – makes this high-impact. Compromise of HVAC controls can cause physical harm. EPSS 0.05%.
Exploit ScenarioDerived	An attacker reverse-engineers the weak cryptographic implementation in Trane Tracer, forges valid authentication tokens, and gains root access to the HVAC controller. They manipulate temperature setpoints in a data center, causing equipment overheating and outage.

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

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Trane Tracer SC, SC+, and Concierge building automation controllers use broken cryptographic algorithms that allow attackers to bypass authentication and gain root access. These are critical building management systems controlling HVAC in commercial facilities.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 19:57 CVSS 9.2

Trane Tracer building automation controllers use weak cryptography enabling authentication bypass with root-level access to HVAC control systems.

RemediationAI

Contact Trane for firmware updates. Isolate building automation networks from corporate IT. Implement network monitoring for anomalous BACnet/IP traffic. Apply defense-in-depth with firewalls between BAS and other 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

The authentication mechanism relies on broken or risky cryptographic algorithms (CWE-327) that an attacker can exploit to forge authentication tokens or decrypt credentials. Root access to a building automation controller provides control over HVAC, potentially affecting physical safety and comfort.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.2 CRITICAL

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Attack Requirements

Present

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

A Use of a Broken or Risky Cryptographic Algorithm vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an attacker to bypass authentication and gain root-level access to the device.

Executive ViewAI

Why It Matters

CVE-2026-28252 presents critical security risk, a broken cryptography vulnerability rated CVSS 9.2. Successful exploitation could critically impact the confidentiality, integrity, and availability of affected systems. Organizations should apply vendor updates immediately when available and implement compensating controls in the interim.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score

0.1%

Top 85% exploitable

Data Quality

3 sources

Confidence: Low

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 0.1%

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.