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Fencer Vulns
medium 5.3

CVE-2021-3476 json

A flaw was found in OpenEXR's B44 uncompression functionality in versions before 3.0.0-beta.

published 2021-03-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26798

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

A flaw was found in OpenEXR's B44 uncompression functionality in versions before 3.0.0-beta. An attacker who is able to submit a crafted file to OpenEXR could trigger shift overflows, potentially affecting application availability.

Patch / fix

  • openexr openexr 2.4.3, 2.5.4
  • openexr Debian 14, Debian 13, Debian 12 2.5.4-1

debian advisories DEBIAN-CVE-2021-3476

  • openexr Ubuntu 16.04 LTS 2.2.0-10ubuntu2.6
  • openexr Ubuntu 18.04 LTS 2.2.0-11.1ubuntu1.6
  • openexr Ubuntu 20.04 LTS 2.3.0-6ubuntu0.5

ubuntu advisories UBUNTU-CVE-2021-3476

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • 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
  • openexr SLE Module for Desktop Applications 15 SP2 2.2.1-3.24.1

suse advisories SUSE-SU-2021:2913-1SUSE-SU-2021:2793-1SUSE-SU-2021:1097-1

  • openexr openSUSE Leap 15.2 2.2.1-lp152.7.20.1
  • openexr openSUSE Leap 15.3 2.2.1-3.35.1
  • openexr openSUSE Leap 15.2 2.2.1-lp152.7.11.1

opensuse advisories openSUSE-SU-2021:1198-1openSUSE-SU-2021:2793-1openSUSE-SU-2021:0536-1

  • openexr Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 2.5.4-r0

alpine advisories ALPINE-CVE-2021-3476

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openexr Arch Linux 2.5.4-1

arch linux advisories AVG-1746

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-2021-3476 updated cvss 5.3

OpenEXR: Undefined-shift in Imf_2_5::unpack14

  • 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

1.85% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

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.