What’s Vulnerable › Vulnerabilities

CVE-2021-21657

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-25 · updated 2026-06-17

Description

Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

Affected products

• Jenkins project Jenkins Filesystem Trigger Plugin: through 0.40

References

• http://www.openwall.com/lists/oss-security/2021/05/25/3
• https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2339
• http://www.openwall.com/lists/oss-security/2021/05/25/3
• https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2339

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