How severe is CVE-2021-21656?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Jenkins Xcode Integration

CVE-2021-21656

Jenkins Xcode integration Plugin 2.0.14 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

Published 2021-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.015 (73.5th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Jenkins Xcode Integration
Jenkins Project Xcode Integration Plugin — versions unspecified

References

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

Frequently asked questions

What is CVE-2021-21656?: CVE-2021-21656 is a high-severity vulnerability in Jenkins Xcode Integration. CVSS score: 7.1/10. Published 2021-05-11.
How severe is CVE-2021-21656?: High severity. CVSS v3 base score is 7.1 out of 10.