CVE-2021-20296: Debian Linux

Medium severity, CVSS 5.3. EPSS: 1.7% chance of exploitation in the next 30 days.

A flaw was found in OpenEXR in versions before 3.0.0-beta. A crafted input file supplied by an attacker, that is processed by the Dwa decompression functionality of OpenEXR's IlmImf library, could cause a NULL pointer dereference. The highest threat from this vulnerability is to system availability.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Openexr Openexr: before 2.4.3 (fixed in 2.4.3); from 2.5.0, before 2.5.4 (fixed in 2.5.4)

Published 2021-04-01. Last modified 2026-06-17.