CVE-2021-46243

An untrusted pointer dereference vulnerability exists in HDF5 v1.13.1-1 via the function...

6.5 Medium

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).

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.95%Up 0.4 points since Jan 22, 2022

What each source reports

NVD Score used 6.5

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).

Record: CVE-2021-46243
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-476
Updated: 2026-11-02

CVE List No score

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).

Record: CVE-2021-46243
Updated: 2026-11-02

EUVDEUVD-2021-32943 No score

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).

Record: EUVD-2021-32943
Updated: 2026-11-03

GitHub AdvisoriesGHSA-2rqw-mg55-mp69 No score

An untrusted pointer dereference vulnerability exists in HDF5 v1.13.1-1 via the function...

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).

Record: GHSA-2rqw-mg55-mp69
Weakness: CWE-476
Updated: 2026-11-02

OSV 6.5

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).

Record: CVE-2021-46243
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-46243 6.5

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).

Record: DEBIAN-CVE-2021-46243
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-46243 6.5

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).

Record: UBUNTU-CVE-2021-46243
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-06

Affected products

hdfgroup hdf5

Affected packages

Affected packages
Package	Affected	Fixed
`hdf5` Debian:12	All versions, plus listed versions 1.10.10+repack-11.10.10+repack-21.10.10+repack-31.10.10+repack-3.11.10.10+repack-3.2 Show 45 moreShow less 1.10.10+repack-3.2+ports1.10.10+repack-3.31.10.10+repack-41.10.10+repack-51.10.8+repack1-11.12.0+repack-1~exp11.12.0+repack-1~exp21.12.2+repack-1~exp11.14.3+repack-1~exp11.14.3+repack1-1~exp21.14.3+repack1-1~exp31.14.4.3+repack-1~exp11.14.4.3+repack-1~exp21.14.4.3+repack-1~exp31.14.5+repack-11.14.5+repack-1~exp11.14.5+repack-1~exp21.14.5+repack-1~exp31.14.5+repack-1~exp41.14.5+repack-1~exp51.14.5+repack-1~exp61.14.5+repack-21.14.5+repack-31.14.5+repack-3.11.14.5+repack-3~exp11.14.5+repack-3~exp21.14.5+repack-3~exp31.14.5+repack-3~exp41.14.5+repack-41.14.5+repack-4~exp11.14.5+repack-4~exp21.14.5+repack-5~exp21.14.5+repack-5~exp31.14.6+repack-11.14.6+repack-1~exp11.14.6+repack-1~exp101.14.6+repack-1~exp111.14.6+repack-1~exp121.14.6+repack-1~exp131.14.6+repack-1~exp141.14.6+repack-1~exp151.14.6+repack-1~exp161.14.6+repack-1~exp171.14.6+repack-1~exp181.14.6+repack-1~exp19	None known
`hdf5` Debian:13	All versions, plus listed versions 1.14.5+repack-31.14.5+repack-3.11.14.5+repack-41.14.5+repack-4~exp11.14.5+repack-4~exp2 Show 41 moreShow less 1.14.5+repack-5~exp21.14.5+repack-5~exp31.14.6+repack-11.14.6+repack-1~exp11.14.6+repack-1~exp101.14.6+repack-1~exp111.14.6+repack-1~exp121.14.6+repack-1~exp131.14.6+repack-1~exp141.14.6+repack-1~exp151.14.6+repack-1~exp161.14.6+repack-1~exp171.14.6+repack-1~exp181.14.6+repack-1~exp191.14.6+repack-1~exp21.14.6+repack-1~exp201.14.6+repack-1~exp211.14.6+repack-1~exp31.14.6+repack-1~exp41.14.6+repack-1~exp51.14.6+repack-1~exp61.14.6+repack-1~exp71.14.6+repack-1~exp81.14.6+repack-1~exp91.14.6+repack-21.14.6+repack-3~exp12.1.0+repack-12.1.0+repack-1~exp102.1.0+repack-1~exp112.1.0+repack-1~exp32.1.0+repack-1~exp42.1.0+repack-1~exp52.1.0+repack-1~exp62.1.0+repack-1~exp72.1.0+repack-1~exp82.1.0+repack-1~exp92.2.0+repack-12.2.0+repack-22.2.0+repack-32.2.0+repack-42.2.0+repack-5	None known
`hdf5` Debian:14	All versions, plus listed versions 1.14.5+repack-31.14.5+repack-3.11.14.5+repack-41.14.5+repack-4~exp11.14.5+repack-4~exp2 Show 41 moreShow less 1.14.5+repack-5~exp21.14.5+repack-5~exp31.14.6+repack-11.14.6+repack-1~exp11.14.6+repack-1~exp101.14.6+repack-1~exp111.14.6+repack-1~exp121.14.6+repack-1~exp131.14.6+repack-1~exp141.14.6+repack-1~exp151.14.6+repack-1~exp161.14.6+repack-1~exp171.14.6+repack-1~exp181.14.6+repack-1~exp191.14.6+repack-1~exp21.14.6+repack-1~exp201.14.6+repack-1~exp211.14.6+repack-1~exp31.14.6+repack-1~exp41.14.6+repack-1~exp51.14.6+repack-1~exp61.14.6+repack-1~exp71.14.6+repack-1~exp81.14.6+repack-1~exp91.14.6+repack-21.14.6+repack-3~exp12.1.0+repack-12.1.0+repack-1~exp102.1.0+repack-1~exp112.1.0+repack-1~exp32.1.0+repack-1~exp42.1.0+repack-1~exp52.1.0+repack-1~exp62.1.0+repack-1~exp72.1.0+repack-1~exp82.1.0+repack-1~exp92.2.0+repack-12.2.0+repack-22.2.0+repack-32.2.0+repack-42.2.0+repack-5	None known
`hdf5` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 1.8.11-3ubuntu11.8.11-5ubuntu11.8.11-5ubuntu21.8.11-5ubuntu61.8.11-5ubuntu71.8.11-5ubuntu7.11.8.11-5ubuntu7.1+esm11.8.11-5ubuntu7.1+esm2	None known
`vtk` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 5.8.0-14ubuntu15.8.0-14ubuntu35.8.0-14.1ubuntu25.8.0-14.1ubuntu35.8.0-14.1ubuntu3+esm1	None known
`hdf5` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.8.15-patch1+docs-41.8.15-patch1+docs-51.8.16+docs-11.8.16+docs-21.8.16+docs-3 Show 6 moreShow less 1.8.16+docs-3ubuntu11.8.16+docs-41.8.16+docs-4ubuntu11.8.16+docs-4ubuntu1.11.8.16+docs-4ubuntu1.1+esm11.8.16+docs-4ubuntu1.1+esm2	None known
`insighttoolkit4` Ubuntu:16.04:LTS	All versions, plus listed versions 4.8.1-1ubuntu34.8.1-1ubuntu44.8.2-3.1ubuntu14.9.0-3ubuntu24.9.0-4ubuntu14.9.0-4ubuntu1.1	None known
`kissplice` Ubuntu:16.04:LTS	All versions, plus listed versions 2.3.1-1build1	None known
`paraview` Ubuntu:16.04:LTS	All versions, plus listed versions 4.1.0+dfsg+1-2build14.1.0+dfsg+1-35.0.0+dfsg1-2build15.0.0+dfsg1-2build25.0.1+dfsg1-35.0.1+dfsg1-4	None known
`vtk` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 5.10.1+dfsg-25.10.1+dfsg-2build35.10.1+dfsg-2.1build15.10.1+dfsg-2.1ubuntu0.1~esm1	None known

Show 23 moreShow less

Affected packages
Package	Affected	Fixed
`xdmf` Ubuntu:16.04:LTS	All versions, plus listed versions 2.1.dfsg.1-11build22.1.dfsg.1-13	None known
`hdf5` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 1.10.0-patch1+docs-41.10.0-patch1+docs-4ubuntu0.1~esm11.10.0-patch1+docs-4ubuntu0.1~esm2	None known
`insighttoolkit4` Ubuntu:18.04:LTS	All versions, plus listed versions 4.12.2-dfsg1-1ubuntu1	None known
`kissplice` Ubuntu:18.04:LTS	All versions, plus listed versions 2.4.0-p1-12.4.0-p1-2	None known
`paraview` Ubuntu:18.04:LTS	All versions, plus listed versions 5.1.2+dfsg1-25.1.2+dfsg1-2build15.4.1+dfsg3-1	None known
`xdmf` Ubuntu:18.04:LTS	All versions, plus listed versions 3.0+git20160803-3build13.0+git20160803-4	None known
`hdf5` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1.10.4+repack-101.10.4+repack-111.10.4+repack-11ubuntu11.10.4+repack-11ubuntu1+esm1	None known
`insighttoolkit4` Ubuntu:20.04:LTS	All versions, plus listed versions 4.12.2-dfsg1-4.1ubuntu14.13.2-dfsg1-1ubuntu14.13.2-dfsg1-4ubuntu14.13.2-dfsg1-64.13.2-dfsg1-6ubuntu14.13.2-dfsg1-8	None known
`kissplice` Ubuntu:20.04:LTS	All versions, plus listed versions 2.4.0-p1-52.4.0-p1-5build12.4.0-p1-5ubuntu1	None known
`paraview` Ubuntu:20.04:LTS	All versions, plus listed versions 5.4.1+dfsg4-45.7.0-4ubuntu85.7.0-4ubuntu9	None known
`xdmf` Ubuntu:20.04:LTS	All versions, plus listed versions 3.0+git20160803-5build13.0+git20190531-13.0+git20190531-33.0+git20190531-43.0+git20190531-4ubuntu13.0+git20190531-4ubuntu23.0+git20190531-6	None known
`hdf5` Ubuntu:22.04:LTS	All versions, plus listed versions 1.10.6+repack-51.10.7+repack-4ubuntu11.10.7+repack-4ubuntu2	None known
`paraview` Ubuntu:22.04:LTS	All versions, plus listed versions 5.9.0-2ubuntu15.10.0~rc1-1build3	None known
`hdf5` Ubuntu:24.04:LTS	All versions, plus listed versions 1.10.8+repack1-1ubuntu11.10.10+repack-3ubuntu11.10.10+repack-3.1ubuntu31.10.10+repack-3.1ubuntu4	None known
`paraview` Ubuntu:24.04:LTS	All versions, plus listed versions 5.11.0+dfsg-25.11.0+dfsg-2build15.11.2+dfsg-45.11.2+dfsg-65.11.2+dfsg-6build15.11.2+dfsg-6build45.11.2+dfsg-6build5	None known
`kissplice` Ubuntu:25.10	All versions, plus listed versions 2.6.7-12.6.7-2	None known
`paraview` Ubuntu:25.10	All versions, plus listed versions 5.13.2+dfsg-2ubuntu15.13.2+dfsg-2ubuntu25.13.2+dfsg-3	None known
`xdmf` Ubuntu:25.10	All versions, plus listed versions 3.0+git20190531-13.1build73.0+git20190531-13.1build8	None known
`kissplice` Ubuntu:26.10	All versions, plus listed versions 2.6.7-2	None known
`paraview` Ubuntu:26.10	All versions, plus listed versions 6.0.1+dfsg1-76.0.1+dfsg1-86.1.1+dfsg1-2build1	None known
`xdmf` Ubuntu:26.10	All versions, plus listed versions 3.0+git20190531-14build13.0+git20190531-15	None known
`kissplice` Ubuntu:26.04:LTS	All versions, plus listed versions 2.6.7-2	None known
`paraview` Ubuntu:26.04:LTS	All versions, plus listed versions 5.13.2+dfsg-35.13.2+dfsg-3ubuntu15.13.2+dfsg-3.16.0.1+dfsg1-6ubuntu16.0.1+dfsg1-7	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-46243 is a medium vulnerability (CVSS 6.5) in Hdfgroup Hdf5, published January 21, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.95%, the 61st percentile. No source names a fixed version.

References

This page doesn't list everything

Left out here: 27 versions. The JSON record has them.