CVE-2021-42534 json
Trane Building Automation Controllers Cross-site Scripting
published 2021-10-22 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29503
- cvss
- 6.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
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.
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-21-292-02 updated cvss 6.3
Trane HVAC Systems Controls
-
Trane Tracer SC <= 3.8affected: vendor fix, mitigation “Restrict physical controller access to trained and trusted personnel.” trane.com
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
0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- Trane Tracer SC
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
us-cert.cisa.gov
/ics/advisories/icsa-21-292-02
third-party-advisory, us-government-resource
Sources
- CVE List CVE-2021-42534
- NVD CVE-2021-42534
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