What is CVE-2021-21701?

CVE-2021-21701 is a medium-severity vulnerability in Jenkins Performance, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 6.5/10. Published 2021-11-12.

How severe is CVE-2021-21701?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XXE in Jenkins Performance

CVE-2021-21701

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

Vulnerability class: XXE (XML External Entity)

Published 2021-11-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.017 (76.7th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: +0.001

Affected products

Jenkins Performance
Jenkins Project Performance Plugin — versions unspecified, next of 3.20

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

www.jenkins.io/security/advisory/2021-11-12/ (Vendor Advisory)
www.openwall.com/lists/oss-security/2021/11/12/1 (mailing-list, Mailing List, Third Party Advisory)
www.zerodayinitiative.com/advisories/ZDI-21-1313/ (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21701?: CVE-2021-21701 is a medium-severity vulnerability in Jenkins Performance, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 6.5/10. Published 2021-11-12.
How severe is CVE-2021-21701?: Medium severity. CVSS v3 base score is 6.5 out of 10.