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MEDIUM severity

CVE-2021-21701 — performance

MEDIUM

CVE-2021-21701 is a medium-severity (CVSS 6.5) XML External Entity (XXE) vulnerability in org.jenkins-ci.plugins:performance. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

XXE vulnerability in Jenkins Performance Plugin

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs78th percentile — riskier than 78% of all scored CVEsHighest risk
0.00%0.74%1.48%2.23%0.4%1.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.jenkins-ci.plugins:performance

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Jenkins Performance Plugin 3.20 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

This allows attackers able to control workspace contents to have Jenkins parse a crafted XML report file that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.

As of publication of this advisory, there is no fix.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:performanceall versionsNo fix

Affected Products

1 product · 1 configurations
Application
performancejenkins
≤ 3.20
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:performance, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of org.jenkins-ci.plugins:performance for CVE-2021-21701. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

Jenkins Performance Plugin 3.20 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This allows attackers able to control workspace contents to have Jenkins parse a crafted XML report file that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery. As of publication of this advisory, there is no fix.
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CVE-2021-21701: performance SSRF (Medium 6.5)