How severe is CVE-2021-21651?

CVE-2021-21651 has a CVSS score of 4.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-21651?

CVE-2021-21651 affects the following packages: org.jenkins-ci.plugins:s3 (Maven), org.jenkins-ci.plugins:s3 (Maven). Ecosystems affected: Maven.

How do I fix CVE-2021-21651?

Update org.jenkins-ci.plugins:s3 to 0.11.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21651 is resolved across your whole dependency graph.

How do I detect CVE-2021-21651 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:s3, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-21651 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2021-21651 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-21651 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-21651?

CVE-2021-21651 has an EPSS (Exploit Prediction Scoring System) score of 0.7%, placing it in the 53th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2021-21651 published, and has it been updated?

CVE-2021-21651 was published on June 16, 2021 and was last updated on February 16, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2021-21651 — s3

MEDIUMFix: jenkinsci/s3-plugin@2e85e45

CVE-2021-21651 is a medium-severity (CVSS 4.3) vulnerability in org.jenkins-ci.plugins:s3. A fix is available for org.jenkins-ci.plugins:s3 — see the affected versions and patch details below.

Missing Authorization in Jenkins S3 publisher Plugin

Published

Jun 16, 2021

Updated

Feb 16, 2024

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Oct 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2021-21651 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected

☕org.jenkins-ci.plugins:s3☕org.jenkins-ci.plugins:s3

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 S3 publisher Plugin prior to 0.11.7 and 0.11.5.1 does not perform a permission check in an HTTP endpoint.

This allows attackers with Overall/Read permission to obtain the list of configured profiles.

S3 publisher Plugin 0.11.7 and 0.11.5.1 performs permission checks when providing a list of configured profiles.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jenkins-ci.plugins:s3`	≥ 0.11.6&&< 0.11.7	0.11.7`org.jenkins-ci.plugins:s3:0.11.7`
☕Maven	`org.jenkins-ci.plugins:s3`	all versions	0.11.5.1`org.jenkins-ci.plugins:s3:0.11.5.1`

Affected Products

1 product · 1 configurations

Application

s3 publisherjenkins

≤ 0.11.6

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:s3, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jenkins-ci.plugins:s3 to 0.11.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21651 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Jenkins S3 publisher Plugin prior to 0.11.7 and 0.11.5.1 does not perform a permission check in an HTTP endpoint. This allows attackers with Overall/Read permission to obtain the list of configured profiles. S3 publisher Plugin 0.11.7 and 0.11.5.1 performs permission checks when providing a list of configured profiles.

O3 Security · Impact-Aware SCA

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