HOMEVULNERABILITIESCVE-2020-27918
HIGH

CVE-2020-27918

CWE-416Published: December 8, 2020· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.

NVD Source

Technical Analysis

CVE-2020-27918 requires local access, meaning attackers must already have a foothold on the target system.

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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

Apple8 product(s)
iclouditunessafariipadosiphone osmacostvoswatchos
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
webkitgtk1 product(s)
webkitgtk\+
Source: NVD CPE · 13 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

ADVISORYhttp://seclists.org/fulldisclosure/2020/Dec/32
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/03/22/1
ADVISORYhttps://security.gentoo.org/glsa/202104-03
ADVISORYhttps://support.apple.com/en-us/HT211928
ADVISORYhttps://support.apple.com/en-us/HT211929
ADVISORYhttps://support.apple.com/en-us/HT211930
ADVISORYhttps://support.apple.com/en-us/HT211931
ADVISORYhttps://support.apple.com/en-us/HT211933
ADVISORYhttps://support.apple.com/en-us/HT211934
ADVISORYhttps://support.apple.com/en-us/HT211935
ADVISORYhttps://www.debian.org/security/2021/dsa-4877
ADVISORYhttp://seclists.org/fulldisclosure/2020/Dec/32
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/03/22/1
ADVISORYhttps://security.gentoo.org/glsa/202104-03
ADVISORYhttps://support.apple.com/en-us/HT211928
ADVISORYhttps://support.apple.com/en-us/HT211929
ADVISORYhttps://support.apple.com/en-us/HT211930
ADVISORYhttps://support.apple.com/en-us/HT211931
ADVISORYhttps://support.apple.com/en-us/HT211933
ADVISORYhttps://support.apple.com/en-us/HT211934
ADVISORYhttps://support.apple.com/en-us/HT211935
ADVISORYhttps://www.debian.org/security/2021/dsa-4877

All References (28)

→
http://seclists.org/fulldisclosure/2020/Dec/32Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/03/22/1Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EQ3U3VBSOJB46WCO66TEWE5OAXLTU3YW/
→
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/HT211928Vendor Advisory
→
https://support.apple.com/en-us/HT211929Vendor Advisory
→
https://support.apple.com/en-us/HT211930Vendor Advisory
→
https://support.apple.com/en-us/HT211931Vendor Advisory
→
https://support.apple.com/en-us/HT211933Vendor Advisory
→
https://support.apple.com/en-us/HT211934Vendor Advisory
→
https://support.apple.com/en-us/HT211935Vendor Advisory
→
https://www.debian.org/security/2021/dsa-4877Third Party Advisory
→
http://seclists.org/fulldisclosure/2020/Dec/32Mailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2020-27918
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-416
CISA KEVNo
Affected4 vendor(s)
PublishedDec 8, 2020

Related CVEs (CWE-416)

CVE-2010-3116
10.0
CVE-2012-4218
10.0
CVE-2026-13782
10.0
CVE-2010-2302
10.0
CVE-2012-4212
10.0
CVE-2015-3053
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27918 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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