Search for vulnerabilities
Vulnerability details: VCID-skmy-bagw-2udu
Vulnerability ID VCID-skmy-bagw-2udu
Aliases CVE-2021-1820
Summary A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may result in the disclosure of process memory.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-20 Improper Input Validation
CWE-665 Improper Initialization
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1820.json
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00161 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-1820
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-1820
archlinux High https://security.archlinux.org/AVG-2208
archlinux High https://security.archlinux.org/AVG-2209
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1820.json
https://api.first.org/data/v1/epss?cve=CVE-2021-1820
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13543
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13584
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9947
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9948
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9951
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9983
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1817
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1820
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1825
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1826
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30661
1986856 https://bugzilla.redhat.com/show_bug.cgi?id=1986856
AVG-2208 https://security.archlinux.org/AVG-2208
AVG-2209 https://security.archlinux.org/AVG-2209
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:*:*:*:*:*:*:*:*
CVE-2021-1820 https://nvd.nist.gov/vuln/detail/CVE-2021-1820
RHSA-2021:1586 https://access.redhat.com/errata/RHSA-2021:1586
RHSA-2025:10364 https://access.redhat.com/errata/RHSA-2025:10364
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1820.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: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1820
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:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1820
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 0.37719
EPSS Score 0.00161
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:44:14.592690+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.14/community.json 37.0.0