Search for vulnerabilities
Vulnerability details: VCID-ha6z-a62b-aaaj
Vulnerability ID VCID-ha6z-a62b-aaaj
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-665 Improper Initialization
CWE-20 Improper Input Validation
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-1820.html
rhas Moderate https://access.redhat.com/errata/RHSA-2021:1586
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1820.json
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00119 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00143 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00143 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00143 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.00143 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
epss 0.0036 https://api.first.org/data/v1/epss?cve=CVE-2021-1820
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=1986856
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13543
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13584
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9947
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9948
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9951
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9983
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1817
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1820
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1825
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1826
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30661
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-1820
cvssv3 6.5 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
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-1820.html
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
https://support.apple.com/en-us/HT212317
https://support.apple.com/en-us/HT212323
https://support.apple.com/en-us/HT212324
https://support.apple.com/en-us/HT212325
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
GLSA-202202-01 https://security.gentoo.org/glsa/202202-01
RHSA-2021:1586 https://access.redhat.com/errata/RHSA-2021:1586
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
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 0.27652
EPSS Score 0.00119
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.