What is CVE-2021-46243?

CVE-2021-46243 is a medium-severity vulnerability in Hdfgroup Hdf5, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2022-01-21.

How severe is CVE-2021-46243?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Hdfgroup Hdf5

CVE-2021-46243

An untrusted pointer dereference vulnerability exists in HDF5 v1.13.1-1 via the function H5O__dtype_decode_helper () at hdf5/src/H5Odtype.c. This vulnerability can lead to a Denial of Service (DoS).

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (59.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Hdfgroup Hdf5 — versions 1.13.1-1

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/HDFGroup/hdf5/issues/1326 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-46243?: CVE-2021-46243 is a medium-severity vulnerability in Hdfgroup Hdf5, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2022-01-21.
How severe is CVE-2021-46243?: Medium severity. CVSS v3 base score is 6.5 out of 10.