What is CVE-2021-46242?

CVE-2021-46242 is a high-severity vulnerability in Hdfgroup Hdf5, classified under Use After Free. CVSS score: 8.8/10. Published 2022-01-21.

How severe is CVE-2021-46242?

High severity. CVSS v3 base score is 8.8 out of 10.

Use After Free in Hdfgroup Hdf5

CVE-2021-46242

HDF5 v1.13.1-1 was discovered to contain a heap-use-after free via the component H5AC_unpin_entry.

Vulnerability class: Use-After-Free

Published 2022-01-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.0% 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: 0.012 · change: 0.000

Affected products

Hdfgroup Hdf5 — versions 1.13.1-1

Weakness classification (CWE)

CWE-416 — Use After Free

References

github.com/HDFGroup/hdf5/issues/1329 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-46242?: CVE-2021-46242 is a high-severity vulnerability in Hdfgroup Hdf5, classified under Use After Free. CVSS score: 8.8/10. Published 2022-01-21.
How severe is CVE-2021-46242?: High severity. CVSS v3 base score is 8.8 out of 10.