CVE-2021-1799

mediumpriority · track · 27EPSS 0.018 · 78 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.76% (78th) EPSS

CVSS 4.3 · medium

Is it mine?

14 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USLLM-inferred

affected products (14)

Products and version ranges known to be affected.

Apple iOS and iPadOSunspecified → 14.4enisa_euvdEU
Apple macOSunspecified → 11.2enisa_euvdEU
Apple macOSunspecified → 14.0enisa_euvdEU
Apple macOSunspecified → 14.4enisa_euvdEU
Apple macOSunspecified → 7.3enisa_euvdEU
apple ipad os< 14.4nvdUScpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:*
apple iphone os< 14.4nvdUScpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple macos11.0.1 → 11.2nvdUScpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
apple safari< 14.0.3nvdUScpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
apple tvos< 14.4nvdUScpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos< 7.3nvdUScpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
fedoraproject fedora= 32nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
fedoraproject fedora= 33nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
webkitgtk webkitgtk< 2.30.6nvdUScpe:2.3:a:webkitgtk:webkitgtk:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-04-02modified 2026-06-17

references (39)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan