What is CVE-2021-42534?

CVE-2021-42534 is a medium-severity vulnerability in Trane Tracer Sc, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2021-10-22.

How severe is CVE-2021-42534?

Medium severity. CVSS v3 base score is 6.3 out of 10.

XSS in Trane Tracer Sc

CVE-2021-42534

The affected product’s web application does not properly neutralize the input during webpage generation, which could allow an attacker to inject code in the input forms.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-10-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (46.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

us-cert.cisa.gov/ics/advisories/icsa-21-292-02 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42534?: CVE-2021-42534 is a medium-severity vulnerability in Trane Tracer Sc, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2021-10-22.
How severe is CVE-2021-42534?: Medium severity. CVSS v3 base score is 6.3 out of 10.