CVE-2021-21613Network attack vector

Cross-site scripting via unescaped TICS responses

Published Jan 13, 2021 · Updated Aug 3, 2024

Cross-site scripting in Jenkins Project TICS Jenkins Plugin 2020.3.0.6 and earlier allows remote attackers to execute scripts in users' browsers. The results view renders metric values, run descriptions, and quality-gate messages returned by the TICS service without neutralizing HTML; the fix sanitizes formatted values and moves rendering into escaped Jelly expressions. Exploitation requires control of TICS service response content and a Jenkins user to view the affected results page, enabling script execution in that user's browser context.

CVSS severity6.1
Medium
EPSS probability0.95%
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 Jenkins Project TICS Jenkins Plugin 2020.3.0.6 and earlier allows remote attackers to execute scripts in users' browsers. The results view renders metric values, run descriptions, and quality-gate messages returned by the TICS service without neutralizing HTML; the fix sanitizes formatted values and moves rendering into escaped Jelly expressions. Exploitation requires control of TICS service response content and a Jenkins user to view the affected results page, enabling script execution in that user's browser context.

The record

CVE
CVE-2021-21613
Published
Jan 13, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
TICS Jenkins Plugin
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=unspecified <=2020.3.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · TICS Jenkins Pluginversion=unspecified <=2020.3.0.6

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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