Is CVE-2021-20176 in the CISA KEV catalog?

No. CVE-2021-20176 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20176?

CVE-2021-20176 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-20176?

CVE-2021-20176 has an EPSS score of 0.92% (56th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20176?

Upgrade imagemagick on debian 11 to 8:6.9.11.57+dfsg-1 or later. Fixes are available for 31 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20176

MEDIUM

5.5

CVSS v3

NVD

Description

A divide-by-zero flaw was found in ImageMagick 6.9.11-57 and 7.0.10-57 in gem.c. This flaw allows an attacker who submits a crafted file that is processed by ImageMagick to trigger undefined behavior through a division by zero. The highest threat from this vulnerability is to system availability.

CWE-369

How to fix

Remediation Available

imagemagickDebian

Fixed in:8:6.9.11.57+dfsg-1CVE-2021-20176

imagemagickUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.11USN-4988-1

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4USN-4988-1

imagemagick-6.q16Ubuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.11USN-4988-1

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4USN-4988-1

imagemagick-commonUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libimage-magick-perlUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libimage-magick-q16-perlUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagick++-6.q16-5v5Ubuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagick++-6.q16-7Ubuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.11USN-4988-1

libmagick++-6.q16-8Ubuntu

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4USN-4988-1

libmagick++-6.q16-devUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagick++-devUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

libmagick++5Ubuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

libmagickcore-6-arch-configUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickcore-6-headersUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickcore-6.q16-2Ubuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickcore-6.q16-2-extraUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickcore-6.q16-3Ubuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.11USN-4988-1

libmagickcore-6.q16-3-extraUbuntu

Fixed in:8:6.9.7.4+dfsg-16ubuntu6.11USN-4988-1

libmagickcore-6.q16-6Ubuntu

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4USN-4988-1

libmagickcore-6.q16-6-extraUbuntu

Fixed in:8:6.9.10.23+dfsg-2.1ubuntu11.4USN-4988-1

libmagickcore-6.q16-devUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickcore-devUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickcore5Ubuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

libmagickcore5-extraUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

libmagickwand-6.q16-2Ubuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickwand-6.q16-devUbuntu

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

libmagickwand-devUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

libmagickwand5Ubuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

perlmagickUbuntu

Fixed in:8:6.7.7.10-6ubuntu3.13+esm12USN-7164-1

Fixed in:8:6.8.9.9-7ubuntu5.16+esm2USN-5335-1

ImageMagick Q16Windows application

Affected:7.0.0-0 7.0.10-56Fixed in:7.0.10-56ImageMagick Studio LLC

Affected:6.9.11-57Fixed in:6.9.11-57ImageMagick Studio LLC

ImageMagick Q16-HDRIWindows application

Affected:7.0.0-0 7.0.10-56Fixed in:7.0.10-56ImageMagick Studio LLC

Affected:6.9.11-57Fixed in:6.9.11-57ImageMagick Studio LLC

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.92%probability of exploitation in 30 days

56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Third-Party Advisory1

lists.debian.org

Issue Tracking1

bugzilla.redhat.com

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	13%	-	-

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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 2024-11-21.