What is CVE-2021-45833?

CVE-2021-45833 is a medium-severity vulnerability in Hdfgroup Hdf5, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-05.

How severe is CVE-2021-45833?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Hdfgroup Hdf5

CVE-2021-45833

A Stack-based Buffer Overflow Vulnerability exists in HDF5 1.13.1-1 via the H5D__create_chunk_file_map_hyper function in /hdf5/src/H5Dchunk.c, which causes a Denial of Service (context-dependent).

Vulnerability class: Buffer Overflow

Published 2022-01-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Hdfgroup Hdf5 — versions 1.13.1-1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/HDFGroup/hdf5/issues/1313 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-45833?: CVE-2021-45833 is a medium-severity vulnerability in Hdfgroup Hdf5, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-05.
How severe is CVE-2021-45833?: Medium severity. CVSS v3 base score is 5.5 out of 10.