What is CVE-2021-30006?

CVE-2021-30006 is a high-severity vulnerability in Jetbrains Intellij Idea, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2021-05-11.

How severe is CVE-2021-30006?

High severity. CVSS v3 base score is 7.5 out of 10.

XXE in Jetbrains Intellij Idea

CVE-2021-30006

In IntelliJ IDEA before 2020.3.3, XXE was possible, leading to information disclosure.

Vulnerability class: XXE (XML External Entity)

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Jetbrains Intellij Idea

Weakness classification (CWE)

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

References

blog.jetbrains.com (Vendor Advisory)
blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-30006?: CVE-2021-30006 is a high-severity vulnerability in Jetbrains Intellij Idea, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2021-05-11.
How severe is CVE-2021-30006?: High severity. CVSS v3 base score is 7.5 out of 10.