HOMEVULNERABILITIESCVE-2021-1799
MEDIUM

CVE-2021-1799

NVD-CWE-noinfoPublished: April 2, 2021· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-1799 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected Vendors & Products

Apple6 product(s)
safariipad osiphone osmacostvoswatchos
Fedora1 product(s)
fedora
webkitgtk1 product(s)
webkitgtk
Source: NVD CPE · 9 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://security.gentoo.org/glsa/202104-03
ADVISORYhttps://support.apple.com/en-us/HT212146
ADVISORYhttps://support.apple.com/en-us/HT212147
ADVISORYhttps://support.apple.com/en-us/HT212148
ADVISORYhttps://support.apple.com/en-us/HT212149
ADVISORYhttps://support.apple.com/en-us/HT212152
ADVISORYhttps://security.gentoo.org/glsa/202104-03
ADVISORYhttps://support.apple.com/en-us/HT212146
ADVISORYhttps://support.apple.com/en-us/HT212147
ADVISORYhttps://support.apple.com/en-us/HT212148
ADVISORYhttps://support.apple.com/en-us/HT212149
ADVISORYhttps://support.apple.com/en-us/HT212152

All References (16)

→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
→
https://security.gentoo.org/glsa/202104-03Third Party Advisory
→
https://support.apple.com/en-us/HT212146Vendor Advisory
→
https://support.apple.com/en-us/HT212147Vendor Advisory
→
https://support.apple.com/en-us/HT212148Vendor Advisory
→
https://support.apple.com/en-us/HT212149Vendor Advisory
→
https://support.apple.com/en-us/HT212152Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
→
https://security.gentoo.org/glsa/202104-03Third Party Advisory
→
https://support.apple.com/en-us/HT212146Vendor Advisory
→
https://support.apple.com/en-us/HT212147Vendor Advisory
→
https://support.apple.com/en-us/HT212148Vendor Advisory
→
https://support.apple.com/en-us/HT212149Vendor Advisory

Quick Facts

CVE IDCVE-2021-1799
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected3 vendor(s)
PublishedApr 2, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2010-0071
10.0
CVE-2015-6787
10.0
CVE-2019-25136
10.0
CVE-2014-2624
10.0
CVE-2023-45894
10.0
CVE-2008-5010
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-1799 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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