What is CVE-2021-39230?

CVE-2021-39230 is a high-severity vulnerability in Butter Project, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2021-09-21.

How severe is CVE-2021-39230?

High severity. CVSS v3 base score is 8.8 out of 10.

Improper input validation in Butter Project

CVE-2021-39230

Butter is a system usability utility. Due to a kernel error the JPNS kernel is being discontinued. Affected users are recommend to update to the Trinity kernel. There are no workarounds.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-09-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.9th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Butter Project
Frankenderman Butter — versions < 1.5

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/FrankEnderman/Butter/security/advisories/GHSA-4538-4g86-xf6j (Third Party Advisory)
github.com/FrankEnderman/Butter/commit/a4fd717e848306f04f2823ea5f617e4da9f5bbdb (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-39230?: CVE-2021-39230 is a high-severity vulnerability in Butter Project, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2021-09-21.
How severe is CVE-2021-39230?: High severity. CVSS v3 base score is 8.8 out of 10.