What’s Vulnerable › Vulnerabilities

CVE-2021-21621

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-24 · updated 2026-06-17
• Weakness: CWE-200

Description

Jenkins Support Core Plugin 2.72 and earlier provides the serialized user authentication as part of the "About user (basic authentication details only)" information, which can include the session ID of the user creating the support bundle in some configurations.

Affected products

• Jenkins project Jenkins Support Core Plugin: through 2.72

References

• https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2150
• https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2150

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