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Vulnerability details: VCID-brfq-6y8v-cqaj
Vulnerability ID VCID-brfq-6y8v-cqaj
Aliases CVE-2021-1799
Summary A port redirection issue was addressed with additional port validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. A malicious website may be able to access restricted ports on arbitrary servers.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1799.json
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00201 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00207 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
epss 0.00207 https://api.first.org/data/v1/epss?cve=CVE-2021-1799
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-1799
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-1799
archlinux High https://security.archlinux.org/AVG-1721
archlinux High https://security.archlinux.org/AVG-1722
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1799.json
https://api.first.org/data/v1/epss?cve=CVE-2021-1799
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27918
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29623
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1765
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1789
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1799
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1801
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1870
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21806
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1944340 https://bugzilla.redhat.com/show_bug.cgi?id=1944340
ASA-202103-24 https://security.archlinux.org/ASA-202103-24
ASA-202103-25 https://security.archlinux.org/ASA-202103-25
AVG-1721 https://security.archlinux.org/AVG-1721
AVG-1722 https://security.archlinux.org/AVG-1722
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:a:webkitgtk:webkitgtk:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:webkitgtk:webkitgtk:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:*
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:fedoraproject:fedora:32:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
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-2021-1799 https://nvd.nist.gov/vuln/detail/CVE-2021-1799
RHSA-2021:4381 https://access.redhat.com/errata/RHSA-2021:4381
RHSA-2025:10364 https://access.redhat.com/errata/RHSA-2025:10364
USN-4894-1 https://usn.ubuntu.com/4894-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-1799.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: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
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1799
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:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1799
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 0.42565
EPSS Score 0.00201
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:34:20.722131+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.19/community.json 37.0.0