Security readout for executives and security teams
CVE-2021-21666 is a reflected XSS issue in Jenkins Kiuwan Plugin 1.6.0 and earlier. A malicious link or request could make Jenkins return attacker-controlled query text in an error message without proper escaping, causing script execution in a user’s browser. Exposure is limited to Jenkins environments with Kiuwan Plugin 1.6.0 or earlier installed. Risk increases where Jenkins is reachable by broad user populations or administrators may access untrusted links while authenticated. Treat as a targeted browser-risk issue for Jenkins users, not as confirmed widespread exploitation. Prioritize review if Jenkins is internet-accessible, heavily used by privileged staff, or the Kiuwan Plugin is still installed. Mitigation focus: Inventory Jenkins controllers for Kiuwan Plugin installation and version.; Check Jenkins advisory SECURITY-2367 for current vendor remediation guidance.; Upgrade if Jenkins provides a fixed Kiuwan Plugin release..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2021-21666 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.jenkins.io/security/advisory/2021-06-10/#SECURITY-2367CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.