CVE-2020-9949

Name: CVE-2020-9949
Creator: NVD / NIST
Published: 2020-12-08T20:15:16.777+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.44%

Last modified Jun 17, 2026

CVE-2020-9949 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 7.0, iOS 14.0 and iPadOS 14.0, macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra, tvOS 14.0. EPSS estimates a 1.44% 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 7.0, iOS 14.0 and iPadOS 14.0, macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra, tvOS 14.0. An application may be able to execute arbitrary code with kernel privileges.

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

1.44%

69.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.0
Apple	Iphone Os	< 14.0
Apple	Mac Os X	< 10.15.6
Apple	Mac Os X	>= 11.0.0, < 11.0.1
Apple	Tvos	< 14.0
Apple	Watchos	< 7.0

References

http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
https://support.apple.com/en-us/HT211289Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211843Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211844Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211850Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211931Release Notes, Vendor Advisory
http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
https://support.apple.com/en-us/HT211289Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211843Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211844Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211850Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT211931Release Notes, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2020-9949?

How severe is CVE-2020-9949?

CVE-2020-9949 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.44% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9949?

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-2020-9949?

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

Scan your code now

Source: NVD / NIST