What is CVE-2021-31900?

CVE-2021-31900 is a medium-severity vulnerability in Jetbrains Code With Me. CVSS score: 5.3/10. Published 2021-05-11.

How severe is CVE-2021-31900?

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

Vulnerability in Jetbrains Code With Me

CVE-2021-31900

In JetBrains Code With Me bundled to the compatible IDE versions before 2021.1, a client could open a browser on a host.

Published 2021-05-11 · 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:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Jetbrains Code With Me

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-2021-31900?: CVE-2021-31900 is a medium-severity vulnerability in Jetbrains Code With Me. CVSS score: 5.3/10. Published 2021-05-11.
How severe is CVE-2021-31900?: Medium severity. CVSS v3 base score is 5.3 out of 10.