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Vulnerability details: VCID-uexp-pub6-zydy

Essentials
Severities (22)
References (28)
Severity details (4)
Exploits (0)
EPSS
History (1)

Vulnerability ID	VCID-uexp-pub6-zydy
Aliases	CVE-2021-30823
Summary	A logic issue was addressed with improved restrictions. This issue is fixed in macOS Monterey 12.0.1, iOS 14.8 and iPadOS 14.8, tvOS 15, Safari 15, watchOS 8. An attacker in a privileged network position may be able to bypass HSTS.
Status	Published
Exploitability	0.5
Weighted Severity	5.9
Risk	3.0
Affected and Fixed Packages	Package Details

Weaknesses (0)

There are no known CWE.

System	Score	Found at
cvssv3	6.5	https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-30823.json
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
epss	0.00502	https://api.first.org/data/v1/epss?cve=CVE-2021-30823
cvssv3.1	6.5	https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2	4.0	https://nvd.nist.gov/vuln/detail/CVE-2021-30823
cvssv3.1	6.5	https://nvd.nist.gov/vuln/detail/CVE-2021-30823

Reference id	Reference type	URL
		https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-30823.json
		https://api.first.org/data/v1/epss?cve=CVE-2021-30823
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30818
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30823
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30846
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30851
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30884
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30888
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30889
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42762
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45481
		https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45483
		https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
		https://support.apple.com/en-us/HT212815
		https://support.apple.com/en-us/HT212816
		https://support.apple.com/en-us/HT212819
		https://support.apple.com/kb/HT212953
		http://www.openwall.com/lists/oss-security/2021/12/20/6
2034373		https://bugzilla.redhat.com/show_bug.cgi?id=2034373
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::::::::
CVE-2021-30823		https://nvd.nist.gov/vuln/detail/CVE-2021-30823
RHSA-2022:1777		https://access.redhat.com/errata/RHSA-2022:1777
RHSA-2025:10364		https://access.redhat.com/errata/RHSA-2025:10364

No exploits are available.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-30823.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

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:L/UI:N/S:U/C:N/I:H/A:N 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

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:S/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30823

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

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

partial

complete

none

partial

complete

none

partial

complete

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30823

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

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	0.64978
EPSS Score	0.00502
Published At	July 30, 2025, 12:55 p.m.

Date	Actor	Action	Source	VulnerableCode Version
2025-07-31T08:59:24.045530+00:00	Alpine Linux Importer	Import	https://secdb.alpinelinux.org/v3.17/community.json	37.0.0