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Vulnerability details: VCID-a2cp-2pxa-puc3
Vulnerability ID VCID-a2cp-2pxa-puc3
Aliases CVE-2021-30720
Summary A logic issue was addressed with improved restrictions. This issue is fixed in tvOS 14.6, iOS 14.6 and iPadOS 14.6, Safari 14.1.1, macOS Big Sur 11.4, watchOS 7.5. A malicious website may be able to access restricted ports on arbitrary servers.
Status Published
Exploitability 0.5
Weighted Severity 8.4
Risk 4.2
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-20 Improper Input Validation
CWE-287 Improper Authentication
System Score Found at
cvssv3 9.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-30720.json
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
epss 0.00464 https://api.first.org/data/v1/epss?cve=CVE-2021-30720
cvssv2 5.8 https://nvd.nist.gov/vuln/detail/CVE-2021-30720
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2021-30720
archlinux High https://security.archlinux.org/AVG-2220
archlinux High https://security.archlinux.org/AVG-2221
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-30720.json
https://api.first.org/data/v1/epss?cve=CVE-2021-30720
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21775
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21779
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30663
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30665
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30689
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30720
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30734
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30744
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30749
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30758
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30795
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30797
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30799
https://support.apple.com/en-us/HT212528
https://support.apple.com/en-us/HT212533
1986883 https://bugzilla.redhat.com/show_bug.cgi?id=1986883
ASA-202107-67 https://security.archlinux.org/ASA-202107-67
ASA-202107-68 https://security.archlinux.org/ASA-202107-68
AVG-2220 https://security.archlinux.org/AVG-2220
AVG-2221 https://security.archlinux.org/AVG-2221
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-2021-30720 https://nvd.nist.gov/vuln/detail/CVE-2021-30720
RHSA-2021:4381 https://access.redhat.com/errata/RHSA-2021:4381
RHSA-2025:10364 https://access.redhat.com/errata/RHSA-2025:10364
USN-5024-1 https://usn.ubuntu.com/5024-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-30720.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:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30720
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:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30720
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 0.6333
EPSS Score 0.00464
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:42:22.253758+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/5024-1/ 37.0.0