CVE-2020-27918

Name: CVE-2020-27918
Creator: NVD / NIST
Published: 2020-12-08T22:15:18.727+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.36%

Last modified Jun 17, 2026

CVE-2020-27918 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

1.36%

68.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Apple	Icloud	< 11.5
Apple	Itunes	< 12.11
Apple	Safari	< 14.0.1
Apple	Ipados	< 14.2
Apple	Iphone Os	< 14.2
Apple	Macos	< 11.0.1
Apple	Tvos	< 14.2
Apple	Watchos	< 7.1
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Debian	Debian Linux	10.0
Webkitgtk	Webkitgtk\+	< 2.30.6

References

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
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

Timeline

Published: Dec 8, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27918?

How severe is CVE-2020-27918?

CVE-2020-27918 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27918?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27918?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST