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Fencer Vulns
high 7.5

CVE-2021-38448 json

Trane Symbio Improper Control of Generation of Code

published 2021-11-22 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24900

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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.

Patch / fix

  • Trane Symbio 1.00.0007, 1.00.0023

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-266-01 updated cvss 7.5

Trane Symbio (Update B)

  • Trane Agility Water-Cooled Chiller Model HDWA < 1.00.0010 Trane Ascend Air-Cooled Chiller Model ACR < 1.10.0010 Trane IntelliPak Rooftop Air Conditioner < 1.30.0008 Trane Odyssey Split Systems < 1.00.0023
    affected: mitigation “Ensure user credentials are not shared and follow best practices for appropriate complexity (e.g., strong passwords).”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
NVD 3.1 7.6 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Trane Symbio

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.