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CVE-2021-20304

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass...

7.5 HighFix available

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.07%Up 1.1 points since Aug 24, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Record
CVE-2021-20304
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
CVE List No score

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Record
CVE-2021-20304
Weakness
CWE-190
Updated
2026-11-02
EUVDEUVD-2021-7729 No score

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Record
EUVD-2021-7729
Updated
2026-11-03
GitHub AdvisoriesGHSA-m48r-2qrf-q5hh 7.5

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass...

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Record
GHSA-m48r-2qrf-q5hh
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
OSV 7.5

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Record
CVE-2021-20304
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-20304 7.5

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Record
DEBIAN-CVE-2021-20304
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 9 moreShow less
OSVOESA-2022-1867 5.3

OpenEXR security update

OpenEXR is a high dynamic-range (HDR) image file format originally developed by Industrial Light & Magic for use in computer imaging applications.

Security Fix(es):

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.(CVE-2021-20304)

Record
OESA-2022-1867
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVOESA-2022-1868 5.3

OpenEXR security update

OpenEXR is a high dynamic-range (HDR) image file format originally developed by Industrial Light & Magic for use in computer imaging applications.

Security Fix(es):

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.(CVE-2021-20304)

Record
OESA-2022-1868
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2021-20304 7.5

A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.

Record
UBUNTU-CVE-2021-20304
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVCLSA-2026-1788167338 No score

Fix CVE(s): CVE-2021-20298, CVE-2021-20299, CVE-2021-20304

  • SECURITY UPDATE: Memory exhaustion in the B44 compressor
    • debian/patches/CVE-2021-20298.patch: size _tmpBuffer in elements rather than bytes in IlmImf/ImfB44Compressor.cpp.
    • CVE-2021-20298
  • SECURITY UPDATE: Null dereference on multipart files with no parts
    • debian/patches/CVE-2021-20299.patch: require at least one header in IlmImf/ImfMultiPartInputFile.cpp.
    • CVE-2021-20299
  • SECURITY UPDATE: Undefined right shift in hufDecode
    • debian/patches/CVE-2021-20304.patch: reject over-long Huffman code lengths in IlmImf/ImfHuf.cpp.
    • CVE-2021-20304
Record
CLSA-2026-1788167338
Updated
2026-11-02
OSVopenSUSE-SU-2021:1198-1 No score

Security update for openexr

This update for openexr fixes the following issues:

  • CVE-2021-20298 [bsc#1188460]: Fixed Out-of-memory in B44Compressor
  • CVE-2021-20299 [bsc#1188459]: Fixed Null-dereference READ in Imf_2_5:Header:operator
  • CVE-2021-20300 [bsc#1188458]: Fixed Integer-overflow in Imf_2_5:hufUncompress
  • CVE-2021-20302 [bsc#1188462]: Fixed Floating-point-exception in Imf_2_5:precalculateTileInfot
  • CVE-2021-20303 [bsc#1188457]: Fixed Heap-buffer-overflow in Imf_2_5::copyIntoFrameBuffer
  • CVE-2021-20304 [bsc#1188461]: Fixed Undefined-shift in Imf_2_5:hufDecode

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2021:1198-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:2793-1 No score

Security update for openexr

This update for openexr fixes the following issues:

  • CVE-2021-20298 [bsc#1188460]: Fixed Out-of-memory in B44Compressor
  • CVE-2021-20299 [bsc#1188459]: Fixed Null-dereference READ in Imf_2_5:Header:operator
  • CVE-2021-20300 [bsc#1188458]: Fixed Integer-overflow in Imf_2_5:hufUncompress
  • CVE-2021-20302 [bsc#1188462]: Fixed Floating-point-exception in Imf_2_5:precalculateTileInfot
  • CVE-2021-20303 [bsc#1188457]: Fixed Heap-buffer-overflow in Imf_2_5::copyIntoFrameBuffer
  • CVE-2021-20304 [bsc#1188461]: Fixed Undefined-shift in Imf_2_5:hufDecode
Record
openSUSE-SU-2021:2793-1
Updated
2026-11-02
OSVSUSE-SU-2021:14846-1 No score

Security update for OpenEXR

This update for OpenEXR fixes the following issues:

  • CVE-2021-20298: Fixed out-of-memory in B44Compressor (bsc#1188460).
  • CVE-2021-20300: Fixed integer-overflow in Imf_2_5:hufUncompress (bsc#1188458).
  • CVE-2021-20303: Fixed heap-buffer-overflow in Imf_2_5::copyIntoFrameBuffe (bsc#1188457).
  • CVE-2021-20304: Fixed undefined-shift in Imf_2_5:hufDecode (bsc#1188461).
  • CVE-2021-3941: Fixed divide-by-zero in Imf_3_1:RGBtoXYZ (bsc#1192556).
Record
SUSE-SU-2021:14846-1
Updated
2026-11-02
OSVSUSE-SU-2021:2793-1 No score

Security update for openexr

This update for openexr fixes the following issues:

  • CVE-2021-20298 [bsc#1188460]: Fixed Out-of-memory in B44Compressor
  • CVE-2021-20299 [bsc#1188459]: Fixed Null-dereference READ in Imf_2_5:Header:operator
  • CVE-2021-20300 [bsc#1188458]: Fixed Integer-overflow in Imf_2_5:hufUncompress
  • CVE-2021-20302 [bsc#1188462]: Fixed Floating-point-exception in Imf_2_5:precalculateTileInfot
  • CVE-2021-20303 [bsc#1188457]: Fixed Heap-buffer-overflow in Imf_2_5::copyIntoFrameBuffer
  • CVE-2021-20304 [bsc#1188461]: Fixed Undefined-shift in Imf_2_5:hufDecode
Record
SUSE-SU-2021:2793-1
Updated
2026-11-02
OSVSUSE-SU-2021:2913-1 No score

Security update for openexr

This update for openexr fixes the following issues:

  • CVE-2021-20298 [bsc#1188460]: Fixed Out-of-memory in B44Compressor
  • CVE-2021-20299 [bsc#1188459]: Fixed Null-dereference READ in Imf_2_5:Header:operator
  • CVE-2021-20300 [bsc#1188458]: Fixed Integer-overflow in Imf_2_5:hufUncompress
  • CVE-2021-20302 [bsc#1188462]: Fixed Floating-point-exception in Imf_2_5:precalculateTileInfot
  • CVE-2021-20303 [bsc#1188457]: Fixed Heap-buffer-overflow in Imf_2_5::copyIntoFrameBuffer
  • CVE-2021-20304 [bsc#1188461]: Fixed Undefined-shift in Imf_2_5:hufDecode
Record
SUSE-SU-2021:2913-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libopenexr-dev
TuxCare:Ubuntu:18.04
From an advisory covering 3 CVEs
 before 2.2.0-11.1ubuntu1.9+tuxcare.els2
2.2.0-11.1ubuntu1.9+tuxcare.els2
libopenexr22
TuxCare:Ubuntu:18.04
From an advisory covering 3 CVEs
 before 2.2.0-11.1ubuntu1.9+tuxcare.els2
2.2.0-11.1ubuntu1.9+tuxcare.els2
openexr
TuxCare:Ubuntu:18.04
From an advisory covering 3 CVEs
 before 2.2.0-11.1ubuntu1.9+tuxcare.els2
2.2.0-11.1ubuntu1.9+tuxcare.els2
openexr-doc
TuxCare:Ubuntu:18.04
From an advisory covering 3 CVEs
 before 2.2.0-11.1ubuntu1.9+tuxcare.els2
2.2.0-11.1ubuntu1.9+tuxcare.els2
openexr
Debian:12
 before 2.5.4-1
2.5.4-1
openexr
Debian:13
 before 2.5.4-1
2.5.4-1
openexr
Debian:14
 before 2.5.4-1
2.5.4-1
OpenEXR
openEuler:20.03-LTS-SP1
 before 2.2.0-27.oe1
2.2.0-27.oe1
OpenEXR
openEuler:20.03-LTS-SP3
 before 2.2.0-27.oe1
2.2.0-27.oe1
OpenEXR
SUSE:Linux Enterprise Point of Sale 11 SP3
From an advisory covering 5 CVEs
 before 1.6.1-83.17.30.1
1.6.1-83.17.30.1
Show 36 moreShow less
Affected packages
PackageAffectedFixed
OpenEXR
SUSE:Linux Enterprise Server 11 SP4-LTSS
From an advisory covering 5 CVEs
 before 1.6.1-83.17.30.1
1.6.1-83.17.30.1
openexr
SUSE:Linux Enterprise Module for Desktop Applications 15 SP2
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise Module for Desktop Applications 15 SP3
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise High Performance Computing 15-LTSS
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise Server 15-LTSS
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise Server 15 SP1-BCL
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise Server 15 SP1-LTSS
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise Server for SAP Applications 15
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Linux Enterprise Server for SAP Applications 15 SP1
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Manager Proxy 4.0
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Manager Retail Branch Server 4.0
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Manager Server 4.0
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:Enterprise Storage 6
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1
openexr
SUSE:HPE Helion OpenStack 8
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:OpenStack Cloud 8
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:OpenStack Cloud 9
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:OpenStack Cloud Crowbar 8
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:OpenStack Cloud Crowbar 9
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server for SAP Applications 12 SP3
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server 12 SP2-BCL
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server 12 SP3-LTSS
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server 12 SP3-BCL
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server 12 SP4-LTSS
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
SUSE:Linux Enterprise Workstation Extension 12 SP5
From an advisory covering 7 CVEs
 before 2.1.0-6.37.1
2.1.0-6.37.1
openexr
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
2.2.0-1ubuntu32.2.0-7ubuntu12.2.0-9ubuntu12.2.0-10ubuntu22.2.0-10ubuntu2.1
Show 8 moreShow less
2.2.0-10ubuntu2.22.2.0-10ubuntu2.32.2.0-10ubuntu2.42.2.0-10ubuntu2.62.2.0-10ubuntu2.6+esm12.2.0-10ubuntu2.6+esm22.2.0-10ubuntu2.6+esm32.2.0-10ubuntu2.6+esm4
 None known
openexr
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.2.0-11ubuntu12.2.0-11.1ubuntu12.2.0-11.1ubuntu1.12.2.0-11.1ubuntu1.22.2.0-11.1ubuntu1.3
Show 6 moreShow less
2.2.0-11.1ubuntu1.42.2.0-11.1ubuntu1.62.2.0-11.1ubuntu1.72.2.0-11.1ubuntu1.82.2.0-11.1ubuntu1.92.2.0-11.1ubuntu1.9+esm1
 None known
openexr
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.2.1-4.1ubuntu12.3.0-62.3.0-6build12.3.0-6ubuntu0.12.3.0-6ubuntu0.2
Show 4 moreShow less
2.3.0-6ubuntu0.32.3.0-6ubuntu0.52.3.0-6ubuntu0.5+esm12.3.0-6ubuntu0.5+esm2
 None known
openexr
openSUSE:Leap 15.2
From an advisory covering 7 CVEs
 before 2.2.1-lp152.7.20.1
2.2.1-lp152.7.20.1
openexr
openSUSE:Leap 15.3
From an advisory covering 7 CVEs
 before 2.2.1-3.35.1
2.2.1-3.35.1

History

History
RecordedChangedSources
affected, facts
aliases, productsEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-20304 is a high vulnerability (CVSS 7.5) in Academysoftwarefoundation Openexr, published August 20, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.07%, the 81st percentile. Fixed in openexr 2.5.4-1.

References

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