CVE-2021-20244

Application crash via ImplodeImage divide by zero

Published Mar 9, 2021 · Updated Aug 3, 2024

Divide-by-zero in ImageMagick 7.0.10-62 allows context-dependent attackers to crash an image-processing application via a crafted image. ImplodeImage in MagickCore/visual-effects.c directly divides by zero-valued image dimensions, radius, or scaling factors instead of using PerceptibleReciprocal. The crafted file must be processed by a calling application, and successful triggering interrupts that process through undefined arithmetic behavior.

CVSS severity5.5
Medium
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in ImageMagick 7.0.10-62 allows context-dependent attackers to crash an image-processing application via a crafted image. ImplodeImage in MagickCore/visual-effects.c directly divides by zero-valued image dimensions, radius, or scaling factors instead of using PerceptibleReciprocal. The crafted file must be processed by a calling application, and successful triggering interrupts that process through undefined arithmetic behavior.

The record

CVE
CVE-2021-20244
Published
Mar 9, 2021
Updated
Aug 3, 2024
Vendor
ImageMagick Studio LLC
Product
ImageMagick
Classifications
CWE-369, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 9, 2021CVE 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=ImageMagick 7.0.10-62

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ImageMagick Studio LLC · ImageMagickversion=ImageMagick 7.0.10-62

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
7.1NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:C

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 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-369Divide By Zero
T1204.002User Execution: Malicious File

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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