What is CVE-2021-40589?

CVE-2021-40589 is a critical-severity vulnerability in Zangband-Data Project, classified under Integer Underflow. CVSS score: 9.8/10. Published 2022-06-08.

How severe is CVE-2021-40589?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Integer overflow in Zangband-Data Project

CVE-2021-40589

ZAngband zangband-data 2.7.5 is affected by an integer underflow vulnerability in src/tk/plat.c through the variable fileheader.bfOffBits.

Published 2022-06-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.9th percentile), scored 2026-10-25.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.014 · change: +0.001

Affected products

Zangband-Data Project — versions 2.7.5

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

sourceforge.net/p/zangband/bugs/671/ (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40589?: CVE-2021-40589 is a critical-severity vulnerability in Zangband-Data Project, classified under Integer Underflow. CVSS score: 9.8/10. Published 2022-06-08.
How severe is CVE-2021-40589?: Critical severity. CVSS v3 base score is 9.8 out of 10.