What is CVE-2021-25756?

CVE-2021-25756 is a medium-severity vulnerability in Jetbrains Intellij Idea. CVSS score: 5.3/10. Published 2021-02-03.

How severe is CVE-2021-25756?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Jetbrains Intellij Idea

CVE-2021-25756

In JetBrains IntelliJ IDEA before 2020.2, HTTP links were used for several remote repositories instead of HTTPS.

Published 2021-02-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Jetbrains Intellij Idea

References

blog.jetbrains.com (Product)
blog.jetbrains.com/blog/2021/02/03/jetbrains-security-bulletin-q4-2020/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25756?: CVE-2021-25756 is a medium-severity vulnerability in Jetbrains Intellij Idea. CVSS score: 5.3/10. Published 2021-02-03.
How severe is CVE-2021-25756?: Medium severity. CVSS v3 base score is 5.3 out of 10.