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CVE-2021-21656

23
FAUCET Score

CVE-2021-21656 is a high-severity XML External Entity (XXE) vulnerability affecting Jenkins Xcode integration Plugin versions 2.0.14 and earlier, where the plugin's XML parser is not properly configured to prevent such attacks. This vulnerability has a CVSS score of 7.1, indicating a high impact on confidentiality and a low impact on integrity, and can be exploited remotely with low attack complexity and requiring only low privileges. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.0.14CPE matchmatch criteria
cpe:2.3:a:jenkins:xcode_integration:*:*:*:*:*:jenkins:*:*

CVSS Data

CVSS version used by this source: 3.1

7.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.51%
Probability of exploitation in next 30 days
EPSS Percentile
71.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0151 is in the 69th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:xcode-pluginFixed in: 2.0.15
jenkinsvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-wfxp-4qgw-qp3chigh

XML external entity (XXE) attacks in Jenkins Xcode integration Plugin

Mar 18, 2022

References

jenkins.io / security/advisory/2021-05-11
Vendor Advisory