How severe is CVE-2021-38448?

CVE-2021-38448 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2021-38448 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38448?

CVE-2021-38448 primarily affects Trane Symbio 700. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-38448?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-38448 published?

CVE-2021-38448 was published on 2021-11-22 and last updated on 2026-06-17.

CVE-2021-38448

CVE-2021-38448 is a high-severity vulnerability in Trane Symbio 700 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 4.6
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Trane Symbio 700
Published: 2021-11-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-38448?: CVE-2021-38448 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2021-38448 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38448?: CVE-2021-38448 primarily affects Trane Symbio 700. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-38448?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-38448 published?: CVE-2021-38448 was published on 2021-11-22 and last updated on 2026-06-17.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-266-01

Affected products (2)

cpe:2.3:a:trane:symbio_700:*:*:*:*:*:*:*:*
cpe:2.3:a:trane:symbio_800:*:*:*:*:*:*:*:*

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