CVE-2021-20246

Application crash via zero resampling-filter support

Published Mar 9, 2021 · Updated Aug 3, 2024

Divide by zero in ImageMagick before 6.9.11-62 and before 7.0.10-62 allows attackers to crash applications via crafted images. ScaleResampleFilter divides by F after zero filter support makes F zero; the patch instead uses PerceptibleReciprocal for both calculations. Reachability requires a crafted image to be processed, and the consequence is an application crash rather than data access or modification.

CVSS severity5.5
Medium
EPSS probability1.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Divide by zero in ImageMagick before 6.9.11-62 and before 7.0.10-62 allows attackers to crash applications via crafted images. ScaleResampleFilter divides by F after zero filter support makes F zero; the patch instead uses PerceptibleReciprocal for both calculations. Reachability requires a crafted image to be processed, and the consequence is an application crash rather than data access or modification.

The record

CVE
CVE-2021-20246
Published
Mar 9, 2021
Updated
Aug 3, 2024
Vendor
ImageMagick Studio LLC
Product
ImageMagick
Classifications
CWE-369, T1499
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=ImageMagick 6.9.11-62, ImageMagick 7.0.10-62

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ImageMagick Studio LLC · ImageMagickversion=ImageMagick 6.9.11-62, 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

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-369Divide By Zero
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo