CVE-2026-28253: A Memory Allocation with Excessive Size Value vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concier

Q: How do I fix CVE-2026-28253?

tracer sc firmware: upgrade to newer than 4.4; tracer sc\+ firmware: upgrade to 6.3.2310; tracer concierge: upgrade to 6.3.2310. Exact commands for each OS are on this page.

Q: Is CVE-2026-28253 being exploited?

CVE-2026-28253 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28253 affect?

CVE-2026-28253 affects tracer sc firmware, tracer sc\+ firmware, tracer concierge. Severity is high (CVSS 7.5). A Memory Allocation with Excessive Size Value vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an unauthenticated attacker to cause a denial-of-service condition

Q: How urgent is CVE-2026-28253?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-28253 is a high-severity flaw (CVSS 7.5) affecting tracer sc firmware, tracer sc\+ firmware, tracer concierge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Memory Allocation with Excessive Size Value vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an unauthenticated attacker to cause a denial-of-service condition

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-789
Published	2026-03-12
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: trane

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-12 18:16 UTCPublished CVE record published
2026-06-17 10:28 UTCUpdated Record last modified

trane tracer sc firmware UPGRADE

Affected: <= 4.4 · 4.4 service_pack1 · 4.4 service_pack2 · 4.4 service_pack3 · 4.4 service_pack4 · 4.4 service_pack5 · 4.4 service_pack6

Fixed in: newer than 4.4

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

trane tracer sc\+ firmware UPGRADE

Affected: < 6.3.2310

Fixed in: 6.3.2310

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

trane tracer concierge UPGRADE

Affected: < 6.3.2310

Fixed in: 6.3.2310

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tracer-concierge || rpm -q tracer-concierge || tracer-concierge --version

2. UPGRADE to 6.3.2310 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tracer-concierge

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tracer-concierge

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28253?

tracer sc firmware: upgrade to newer than 4.4; tracer sc\+ firmware: upgrade to 6.3.2310; tracer concierge: upgrade to 6.3.2310. Exact commands for each OS are on this page.

Is CVE-2026-28253 being exploited?

CVE-2026-28253 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28253 affect?

CVE-2026-28253 affects tracer sc firmware, tracer sc\+ firmware, tracer concierge. Severity is high (CVSS 7.5). A Memory Allocation with Excessive Size Value vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an unauthenticated attacker to cause a denial-of-service condition

How urgent is CVE-2026-28253?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-28256 CRITICAL 9.8 UPGRADE UPGRADE A Use of Hard-coded, Security-relevant Constants vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Conc
CVE-2026-28255 CRITICAL 9.8 UPGRADE UPGRADE A Use of Hard-coded Credentials vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow
CVE-2026-28254 HIGH 7.5 UPGRADE UPGRADE A Missing Authorization vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an unau
CVE-2026-28252 CRITICAL 9.8 UPGRADE UPGRADE A Use of a Broken or Risky Cryptographic Algorithm vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Co

References

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