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Vulnerability details: VCID-x1fg-jkra-kffv
Vulnerability ID VCID-x1fg-jkra-kffv
Aliases CVE-2021-20309
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 7.0
Risk 3.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-369 Divide By Zero
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20309.json
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
epss 0.00569 https://api.first.org/data/v1/epss?cve=CVE-2021-20309
cvssv3.1 5.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.8 https://nvd.nist.gov/vuln/detail/CVE-2021-20309
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-20309
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20309.json
https://api.first.org/data/v1/epss?cve=CVE-2021-20309
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20309
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2021/06/msg00000.html
https://lists.debian.org/debian-lts-announce/2023/05/msg00020.html
1013282 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1013282
1946722 https://bugzilla.redhat.com/show_bug.cgi?id=1946722
cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2021-20309 https://nvd.nist.gov/vuln/detail/CVE-2021-20309
USN-5158-1 https://usn.ubuntu.com/5158-1/
USN-5736-1 https://usn.ubuntu.com/5736-1/
USN-6200-1 https://usn.ubuntu.com/6200-1/
USN-USN-5736-2 https://usn.ubuntu.com/USN-5736-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20309.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20309
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20309
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.67606
EPSS Score 0.00569
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:33:19.436115+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.22/community.json 37.0.0