What is CVE-2021-38448?

CVE-2021-38448 is a high-severity vulnerability in Trane Ascend Air-Cooled Chiller Acr, classified under Code Injection. CVSS score: 7.5/10. Published 2021-11-22.

How severe is CVE-2021-38448?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Trane Ascend Air-Cooled Chiller Acr

CVE-2021-38448

The affected controllers do not properly sanitize the input containing code syntax. As a result, an attacker could craft code to alter the intended controller flow of the software.

Vulnerability class: RCE (Remote Code Execution)

Published 2021-11-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (19.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-94 — Code Injection

References

us-cert.cisa.gov/ics/advisories/icsa-21-266-01 (US Government Resource, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2021-38448?: CVE-2021-38448 is a high-severity vulnerability in Trane Ascend Air-Cooled Chiller Acr, classified under Code Injection. CVSS score: 7.5/10. Published 2021-11-22.
How severe is CVE-2021-38448?: High severity. CVSS v3 base score is 7.5 out of 10.