CVE-2021-42534Network attack vector

Authenticated cross-site scripting via unsanitized form input

Published Oct 22, 2021 · Updated Sep 16, 2024

Cross-site scripting in Trane Tracer SC 3.8 and earlier allows remote authenticated users to inject code through web input forms. The web application places submitted form content into generated pages without properly neutralizing executable input. A low-privileged account is required under the CNA assessment, and the public advisory does not identify the affected form, parameter, or persistence behavior.

CVSS severity6.3
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Trane Tracer SC 3.8 and earlier allows remote authenticated users to inject code through web input forms. The web application places submitted form content into generated pages without properly neutralizing executable input. A low-privileged account is required under the CNA assessment, and the public advisory does not identify the affected form, parameter, or persistence behavior.

The record

CVE
CVE-2021-42534
Published
Oct 22, 2021
Updated
Sep 16, 2024
Vendor
Trane
Product
Tracer SC
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All <=3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Trane · Tracer SCversion=All <=3.8

Published CVSS scores

6.3ICS-CERTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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