What is CVE-2021-3889?

CVE-2021-3889 is a high-severity vulnerability in Bfabiszewski Bfabiszewski/libmobi, classified under CWE-823. CVSS score: 8.1/10. Published 2021-10-19.

How severe is CVE-2021-3889?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in Bfabiszewski Bfabiszewski/libmobi

CVE-2021-3889

libmobi is vulnerable to Use of Out-of-range Pointer Offset

Published 2021-10-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.1% 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

Bfabiszewski Bfabiszewski/libmobi — versions unspecified
Libmobi Project

Weakness classification (CWE)

References

github.com/bfabiszewski/libmobi/commit/bec783e6212439a335ba6e8df7ab8ed610ca9a21 (Patch, Third Party Advisory)
huntr.dev/bounties/efb3e261-3f7d-4a45-8114-e0ace6b21516 (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3889?: CVE-2021-3889 is a high-severity vulnerability in Bfabiszewski Bfabiszewski/libmobi, classified under CWE-823. CVSS score: 8.1/10. Published 2021-10-19.
How severe is CVE-2021-3889?: High severity. CVSS v3 base score is 8.1 out of 10.