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CVE-2021-21647

17
FAUCET Score

CVE-2021-21647 is a medium-severity vulnerability affecting Jenkins CloudBees CD Plugin versions 1.1.21 and earlier. It allows authenticated attackers with Item/Read permissions to schedule builds of projects without requiring the Item/Build permission, potentially leading to unauthorized resource consumption or disruption. The attack vector is network-based with low complexity, requiring low privileges, but its impact is limited to low integrity and no confidentiality or availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.1.21CPE matchmatch criteria
cpe:2.3:a:jenkins:cloudbees_cd:*:*:*:*:*:jenkins:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.46%
Probability of exploitation in next 30 days
EPSS Percentile
70.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0146 is in the 84th percentile among its peer group of 21,958 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:electricflowFixed in: 1.1.18.1
mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:electricflowFixed in: 1.1.22
jenkinsvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-7rx6-4vwv-432gmedium

Missing permission check in Jenkins CloudBees CD Plugin allows scheduling builds

May 24, 2022

References

jenkins.io / security/advisory/2021-04-21
Vendor Advisory
openwall.com / lists/oss-security/2021/04/21/2
Mailing ListThird Party Advisory