CVE-2021-21658
XML external entity vulnerability in Jenkins Nuget Plugin
Jenkins Nuget Plugin 1.0 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
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
CVE-2021-21658- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:P/A:N - Updated
- 2026-11-02
CVE List No score
Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
CVE-2021-21658- Updated
- 2026-11-02
EUVDEUVD-2022-4692 No score
Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
EUVD-2022-4692- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-p674-hh8x-rv5h
XML external entity vulnerability in Jenkins Nuget Plugin
Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This XML parser is used for the "Build on NuGet updates" feature.
This allows attackers with the ability to control the contents of the packages.config file in a workspace to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.
Jenkins Nuget Plugin 1.1 disables external entity resolution for its XML parser.
- Record
GHSA-p674-hh8x-rv5h- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-611
- Updated
- 2026-11-02
OSV
Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.
- Record
CVE-2021-21658- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-p674-hh8x-rv5h
XML external entity vulnerability in Jenkins Nuget Plugin
Jenkins Nuget Plugin 1.0 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This XML parser is used for the "Build on NuGet updates" feature.
This allows attackers with the ability to control the contents of the packages.config file in a workspace to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.
Jenkins Nuget Plugin 1.1 disables external entity resolution for its XML parser.
- Record
GHSA-p674-hh8x-rv5h- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-611
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.jenkins-ci.plugins:nugetMaven |
before 1.1 | 1.1 |
org.jenkins-ci.plugins:nugetMaven |
before 1.1, plus listed versions 0.10.20.30.40.50.60.71.0 |
1.1 |
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-2021-21658 is a critical vulnerability (CVSS 9.1) in Jenkins Nuget, published May 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.54%, the 75th percentile. Fixed in org.jenkins-ci.plugins:nuget 1.1.
References
jenkins.io/security/advisory/2021-05-25
openwall.com/lists/oss-security/2021/05/25/3
nvd.nist.gov/vuln/detail/CVE-2021-21658
github.com/jenkinsci/nuget-plugin/commit/542bf38ac52f045741a5670e1644af351878f7e0