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No exploitation reportedFix available

CVE-2021-20304

No exploitation reported by the sources we read.

  • Published2022-08-23
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2022-08-2316:15CVE publishedNVD

Versions per branch

NVD
Openexr
BranchAffectedFixed in
2.5≤ 2.5.7no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openexrUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • openexrUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • openexrUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • openexrTuxCare:Ubuntu:18.04all versions · fixed in 2.2.0-11.1ubuntu1.9+tuxcare.els2and 3 other packages
  • openexrSUSE:OpenStack Cloud Crowbar 9all versions · fixed in 2.1.0-6.37.1
  • openexrSUSE:OpenStack Cloud Crowbar 8all versions · fixed in 2.1.0-6.37.1
  • openexrSUSE:OpenStack Cloud 9all versions · fixed in 2.1.0-6.37.1
  • openexrSUSE:OpenStack Cloud 8all versions · fixed in 2.1.0-6.37.1

35 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-20304 Red Hat Product Security13 known affected

    OpenEXR: Undefined-shift in Imf_2_5::hufDecode

    OpenEXR as a component of Red Hat Enterprise Linux 6 · OpenEXR-devel as a component of Red Hat Enterprise Linux 6 · OpenEXR-libs as a component of Red Hat Enterprise Linux 6 · +10 more

Full record on NVD

Fix

  1. No fix available, says the vendor Red Hat Product Security CVE-2021-20304 · 6 productsFix deferred
  2. No fix planned, says the vendor Red Hat Product Security CVE-2021-20304 · 7 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-190known since 2026-10-23
  • NVDweakness (CWE)CWE-190read 2026-10-23
  • FIRST EPSSEPSS score2.1 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-08-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-m48r-2qrf-q5hh

Frequently asked questions

What is CVE-2021-20304?

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.

Is CVE-2021-20304 actively exploited?

Active exploitation of CVE-2021-20304 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-20304?

CVE-2021-20304 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record