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CVE-2021-21657

27
FAUCET Score

CVE-2021-21657 is a high-severity XML External Entity (XXE) vulnerability affecting Jenkins Filesystem Trigger Plugin versions 0.40 and earlier. This flaw allows an authenticated attacker to remotely execute arbitrary code, access sensitive files, and potentially cause denial of service due to the plugin's XML parser not being configured to prevent XXE attacks. While the CVSS score is 8.8 (High), there is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.40CPE matchmatch criteria
cpe:2.3:a:jenkins:filesystem_trigger:*:*:*:*:*:jenkins:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.60%
Probability of exploitation in next 30 days
EPSS Percentile
73.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0160 is in the 71st percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:fstriggerFixed in: 0.41
jenkinsvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-cphv-7cxw-5hcchigh

XXE vulnerability in Jenkins Filesystem Trigger Plugin

May 24, 2022

References

jenkins.io / security/advisory/2021-05-25
Vendor Advisory
openwall.com / lists/oss-security/2021/05/25/3
Mailing ListThird Party Advisory