CVE-2021-20309

HIGHEPSS 82th pctl

7.5

CVSS v3

Description

A flaw was found in ImageMagick in versions before 7.0.11 and before 6.9.12, where a division by zero in WaveImage() of MagickCore/visual-effects.c may trigger undefined behavior via a crafted image file submitted to an application using ImageMagick. The highest threat from this vulnerability is to system availability.

CWE-369

How to fix

Remediation Available

ImageMagickAmazon

Fixed in:0:6.9.10.97-1.amzn2.0.12

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-c++Amazon

Fixed in:0:6.9.10.97-1.amzn2.0.12

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-c++-debuginfoAmazon

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-c++-develAmazon

Fixed in:0:6.9.10.97-1.amzn2.0.12

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-debuginfoAmazon

Fixed in:0:6.9.10.97-1.amzn2.0.12

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-debugsourceAmazon

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-develAmazon

Fixed in:0:6.9.10.97-1.amzn2.0.12

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-docAmazon

Fixed in:0:6.9.10.97-1.amzn2.0.12

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-libsAmazon

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-libs-debuginfoAmazon

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-perlAmazon

Fixed in:0:6.9.10.97-1.amzn2.0.12

Fixed in:1:6.9.12.82-1.amzn2023.0.7

ImageMagick-perl-debuginfoAmazon

Fixed in:1:6.9.12.82-1.amzn2023.0.7

imagemagickDebian

Fixed in:8:6.9.11.60+dfsg-1.5CVE-2021-20309

imagemagickUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm3USN-5736-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:8:6.7.7.10-6ubuntu3.13+esm1USN-5158-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm1USN-5158-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.12USN-5158-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

imagemagick-6-commonUbuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1USN-5736-1

This Ubuntu release reached end-of-life on 2023-07-20.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.5USN-6200-1

This Ubuntu release reached end-of-life on 2023-07-20.

imagemagick-6.q16Ubuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

imagemagick-6.q16hdriUbuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1USN-5736-1

This Ubuntu release reached end-of-life on 2023-07-20.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.5USN-6200-1

This Ubuntu release reached end-of-life on 2023-07-20.

imagemagick-commonUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm3USN-5736-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

libimage-magick-perlUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

libimage-magick-q16-perlUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

libmagick++-6.q16-5v5Ubuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm1USN-5158-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

libmagick++-6.q16-7Ubuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.12USN-5158-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

libmagick++-6.q16-8Ubuntu

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1USN-5736-1

This Ubuntu release reached end-of-life on 2023-07-20.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.5USN-6200-1

This Ubuntu release reached end-of-life on 2023-07-20.

Fixed in:8:6.9.11.60+dfsg-1.6ubuntu0.23.04.1USN-6200-1

This Ubuntu release reached end-of-life on 2024-01-20.

libmagick++-6.q16-devUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

libmagick++-6.q16hdri-7Ubuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

libmagick++-6.q16hdri-8Ubuntu

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1USN-5736-1

This Ubuntu release reached end-of-life on 2023-07-20.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.5USN-6200-1

This Ubuntu release reached end-of-life on 2023-07-20.

Fixed in:8:6.9.11.60+dfsg-1.6ubuntu0.23.04.1USN-6200-1

This Ubuntu release reached end-of-life on 2024-01-20.

libmagick++-6.q16hdri-devUbuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+esm2USN-6200-1

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.5USN-6200-1

This Ubuntu release reached end-of-life on 2023-07-20.

Fixed in:8:6.9.11.60+dfsg-1.6ubuntu0.23.04.1USN-6200-1

This Ubuntu release reached end-of-life on 2024-01-20.

libmagick++-devUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm3USN-5736-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.8.9.9-7ubuntu5.16+esm8USN-6200-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.15+esm1USN-6200-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.9USN-6200-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

libmagick++5Ubuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm3USN-5736-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:8:6.7.7.10-6ubuntu3.13+esm1USN-5158-1

This Ubuntu release reached end-of-life on 2019-04-02.

libmagickcore-6-arch-configUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm5USN-5736-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.14USN-5736-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4+esm1USN-5736-2

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1USN-5736-2

Fixed in:8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1USN-5736-1

This Ubuntu release reached end-of-life on 2023-07-20.

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

2.31%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory1

lists.debian.org

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-369 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2012-0207	High	7.5	20%	-	Fix
CVE-2017-8537	Medium	5.5	17%	-	-
CVE-2017-8536	Medium	5.5	17%	-	-
CVE-2017-8535	Medium	5.5	17%	-	-
CVE-2007-2237	Medium	5.5	15%	-	-
CVE-2025-0317	High	7.5	14%	-	-

Common questions

How do I fix CVE-2021-20309?

Published advisories record a fix for 53 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-20309 being actively exploited?

Not that we know of. CVE-2021-20309 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 82% of all scored CVEs.

How severe is CVE-2021-20309?

CVE-2021-20309 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-20309 affect?

Published advisories record a fix for ImageMagick (Amazon), ImageMagick-c++ (Amazon), ImageMagick-c++-debuginfo (Amazon), ImageMagick-c++-devel (Amazon), and 49 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-20309

Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.