CVE-2021-21657
XXE vulnerability in Jenkins Filesystem Trigger Plugin
Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
CVE-2021-21657- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
CVE-2021-21657- Updated
- 2026-11-02
EUVDEUVD-2022-3603 No score
Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
EUVD-2022-3603- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cphv-7cxw-5hcc
XXE vulnerability in Jenkins Filesystem Trigger Plugin
Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
This allows attackers with Job/Configure permission or otherwise able to control the contents of an XML file being polled for changes to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the polling Jenkins controller or agent, server-side request forgery, or denial-of-service attacks.
Jenkins Filesystem Trigger Plugin 0.41 disables external entity resolution for its XML parser.
- Record
GHSA-cphv-7cxw-5hcc- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-611
- Updated
- 2026-11-02
OSV
Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
CVE-2021-21657- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-cphv-7cxw-5hcc
XXE vulnerability in Jenkins Filesystem Trigger Plugin
Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
This allows attackers with Job/Configure permission or otherwise able to control the contents of an XML file being polled for changes to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the polling Jenkins controller or agent, server-side request forgery, or denial-of-service attacks.
Jenkins Filesystem Trigger Plugin 0.41 disables external entity resolution for its XML parser.
- Record
GHSA-cphv-7cxw-5hcc- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-611
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.jenkins-ci.plugins:fstriggerMaven |
through 0.40 | 0.41 |
org.jenkins-ci.plugins:fstriggerMaven |
before 0.41, plus listed versions 0.10.100.10.10.110.12 Show 36 moreShow less0.130.140.150.160.170.180.190.20.200.210.220.230.240.250.260.270.280.290.30.300.310.320.330.340.350.360.370.380.390.40.400.50.60.70.80.9 |
0.41 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-21657 is a high vulnerability (CVSS 8.8) in Jenkins Filesystem Trigger, published May 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.60%, the 75th percentile. Fixed in org.jenkins-ci.plugins:fstrigger 0.41.