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Fencer Vulns
critical 9.8

CVE-2021-31009 json

Multiple issues were addressed by removing HDF5.

published 2021-08-24 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17926

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

Multiple issues were addressed by removing HDF5. This issue is fixed in iOS 15.2 and iPadOS 15.2, macOS Monterey 12.1. Multiple issues in HDF5.

Patch / fix

  • Apple iOS and iPadOS 15.2
  • Apple macOS 12.1

Exploit prediction

1.20% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Apple iOS and iPadOS
  • Apple macOS

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.