CVE-2021-3933

Application crash via deep-scanline size overflow

Published Mar 25, 2022 · Updated Aug 3, 2024

Integer overflow in OpenEXR before 3.1.2 allows attackers to crash an application by supplying a crafted deep-scanline image. In ImfMisc.cpp, bytesPerDeepLineTable accumulates pixel-size products in narrow storage without rejecting totals above SIZE_MAX, producing invalid line-size values. The flaw is reachable only where size_t is narrower than 64 bits and an application processes the crafted image; the grounded impact is a crash or instability.

CVSS severity5.5
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in OpenEXR before 3.1.2 allows attackers to crash an application by supplying a crafted deep-scanline image. In ImfMisc.cpp, bytesPerDeepLineTable accumulates pixel-size products in narrow storage without rejecting totals above SIZE_MAX, producing invalid line-size values. The flaw is reachable only where size_t is narrower than 64 bits and an application processes the crafted image; the grounded impact is a crash or instability.

The record

CVE
CVE-2021-3933
Published
Mar 25, 2022
Updated
Aug 3, 2024
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 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?

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  1. Affected versionversion=OpenEXR 3.1.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=OpenEXR 3.1.2

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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