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Vulnerability details: VCID-8ba2-9a7u-3kbv
Vulnerability ID VCID-8ba2-9a7u-3kbv
Aliases CVE-2021-1844
Summary A memory corruption issue was addressed with improved validation. This issue is fixed in iOS 14.4.1 and iPadOS 14.4.1, Safari 14.0.3 (v. 14610.4.3.1.7 and 15610.4.3.1.7), watchOS 7.3.2, macOS Big Sur 11.2.3. Processing maliciously crafted web content may lead to arbitrary code execution.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1844.json
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
epss 0.014 https://api.first.org/data/v1/epss?cve=CVE-2021-1844
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-1844
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-1844
archlinux High https://security.archlinux.org/AVG-1744
archlinux High https://security.archlinux.org/AVG-1745
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1844.json
https://api.first.org/data/v1/epss?cve=CVE-2021-1844
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1788
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1844
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1871
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30682
http://seclists.org/fulldisclosure/2021/Apr/55
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://support.apple.com/en-us/HT212220
https://support.apple.com/en-us/HT212221
https://support.apple.com/en-us/HT212222
https://support.apple.com/en-us/HT212223
https://support.apple.com/kb/HT212323
1944862 https://bugzilla.redhat.com/show_bug.cgi?id=1944862
AVG-1744 https://security.archlinux.org/AVG-1744
AVG-1745 https://security.archlinux.org/AVG-1745
cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
CVE-2021-1844 https://nvd.nist.gov/vuln/detail/CVE-2021-1844
RHSA-2021:4381 https://access.redhat.com/errata/RHSA-2021:4381
RHSA-2025:10364 https://access.redhat.com/errata/RHSA-2025:10364
USN-4939-1 https://usn.ubuntu.com/4939-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1844.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:R/S:U/C:H/I:H/A:H 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:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1844
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:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1844
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 0.7962
EPSS Score 0.014
Published At Aug. 17, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:28:16.021850+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.20/community.json 37.0.0