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Fencer Vulns
high 7.5

CVE-2021-20304 json

A flaw was found in OpenEXR's hufDecode functionality.

published 2022-08-23 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7729

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

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.

Patch / fix

  • openexr Debian 14, Debian 13, Debian 12 2.5.4-1

debian advisories DEBIAN-CVE-2021-20304

  • OpenEXR SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 1.6.1-83.17.30.1
  • openexr SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +12 more 2.1.0-6.37.1
  • openexr SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +12 more 2.2.1-3.35.1

suse advisories SUSE-SU-2021:14846-1SUSE-SU-2021:2913-1SUSE-SU-2021:2793-1

  • openexr openSUSE Leap 15.2 2.2.1-lp152.7.20.1
  • openexr openSUSE Leap 15.3 2.2.1-3.35.1

opensuse advisories openSUSE-SU-2021:1198-1openSUSE-SU-2021:2793-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-20304 updated cvss 7.5

OpenEXR: Undefined-shift in Imf_2_5::hufDecode

  • Red Hat Enterprise Linux 6 OpenEXR, OpenEXR-libs Red Hat Enterprise Linux 7 OpenEXR, OpenEXR-libs
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 OpenEXR, OpenEXR-libs
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.07% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26229 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a OpenEXR

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.