CVE-2021-20303

Application crash via overflowing tile-window calculation

Published Mar 4, 2022 · Updated Aug 3, 2024

Integer overflow in OpenEXR before 2.5.4 allows local users to crash an application by having it process a crafted tiled EXR file. dataWindowForTile adds the tile size to dataWindow.min using an undersized signed integer, which can wrap and cause an insufficient allocation followed by a heap out-of-bounds write. A victim must cause a consuming application to open the file; the documented effects are a crash and possible data corruption, with no confidentiality impact reported.

CVSS severity6.1
Medium
EPSS probability0.82%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in OpenEXR before 2.5.4 allows local users to crash an application by having it process a crafted tiled EXR file. dataWindowForTile adds the tile size to dataWindow.min using an undersized signed integer, which can wrap and cause an insufficient allocation followed by a heap out-of-bounds write. A victim must cause a consuming application to open the file; the documented effects are a crash and possible data corruption, with no confidentiality impact reported.

The record

CVE
CVE-2021-20303
Published
Mar 4, 2022
Updated
Aug 3, 2024
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-190, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed in v2.5.4 and beyond.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=Fixed in v2.5.4 and beyond.

Published CVSS scores

5.8NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:P
6.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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