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CVE-2021-38448

25
FAUCET Score

CVE-2021-38448 is a high-severity vulnerability (CVSS 7.6) affecting various Trane controllers, including Ascend Air-Cooled Chiller ACR, Intellipak 1 & 2, Odyssey Split Systems, Symbio 700, and Symbio 800. The flaw, categorized as CWE-94 (Improper Control of Generation of Code), allows an unauthenticated attacker with physical access to inject malicious code due to insufficient input sanitization, potentially altering the controller's intended operation and leading to complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.00.0023CPE matchmatch criteria
cpe:2.3:a:trane:symbio_700:*:*:*:*:*:*:*:*
< 1.30.0008CPE matchmatch criteria
cpe:2.3:a:trane:symbio_800:*:*:*:*:*:*:*:*
< 1.10.0010CPE matchmatch criteria
cpe:2.3:a:trane:symbio_800:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H

Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.9
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.27%
Probability of exploitation in next 30 days
EPSS Percentile
19.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0027 is in the 61st percentile among its peer group of 78 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

us-cert.cisa.gov / ics/advisories/icsa-21-266-01
MitigationThird Party AdvisoryUS Government Resource