How severe is CVE-2021-40589?

CVE-2021-40589 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40589 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40589?

CVE-2021-40589 affects Zangband-data Project Zangband-data. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40589?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-40589 published?

CVE-2021-40589 was published on 2022-06-08 and last updated on 2026-06-17.

CVE-2021-40589

CVE-2021-40589 is a critical-severity vulnerability in Zangband-data Project Zangband-data with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-191
Affected product: Zangband-data Project Zangband-data
Published: 2022-06-08
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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.
How severe is CVE-2021-40589?: CVE-2021-40589 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40589 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40589?: CVE-2021-40589 affects Zangband-data Project Zangband-data. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40589?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-40589 published?: CVE-2021-40589 was published on 2022-06-08 and last updated on 2026-06-17.

References

https://sourceforge.net/p/zangband/bugs/671/

Affected products (1)

cpe:2.3:a:zangband-data_project:zangband-data:2.7.5:*:*:*:*:*:*:*

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