PatchTheCVECVE-2021-39230: Butter is a system usability utility
CVE-2021-39230 is a high-severity flaw (CVSS 8.8) affecting butter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 45%) |
| CISA exploited list | No |
| Weakness | CWE-20 |
| Published | 2021-09-21 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-39230?
butter: upgrade to 1.5. Exact commands for each OS are on this page.
Is CVE-2021-39230 being exploited?
CVE-2021-39230 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-39230 affect?
CVE-2021-39230 affects butter. Severity is high (CVSS 8.8). 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.
How urgent is CVE-2021-39230?
Priority 45/100. High severity