CVE-2021-20303

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-03-04 · updated 2026-06-17
Weakness: CWE-190

Description

A flaw found in function dataWindowForTile() of IlmImf/ImfTiledMisc.cpp. An attacker who is able to submit a crafted file to be processed by OpenEXR could trigger an integer overflow, leading to an out-of-bounds write on the heap. The greatest impact of this flaw is to application availability, with some potential impact to data integrity as well.

Affected products

Debian Linux: 10.0
AcademySoftwareFoundation openexr: before 2.5.4 — fixed in 2.5.4

How to fix

Upgrade to a fixed version: AcademySoftwareFoundation openexr 2.5.4. Check the vendor advisory for mitigations.

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25505
https://bugzilla.redhat.com/show_bug.cgi?id=1939151
https://github.com/AcademySoftwareFoundation/openexr/pull/831
https://lists.debian.org/debian-lts-announce/2022/12/msg00022.html
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25505
https://bugzilla.redhat.com/show_bug.cgi?id=1939151
https://github.com/AcademySoftwareFoundation/openexr/pull/831
https://lists.debian.org/debian-lts-announce/2022/12/msg00022.html

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