CVE-2020-9876

Name: CVE-2020-9876
Creator: NVD / NIST
Published: 2020-10-22T18:15:14.69+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.95%

Last modified Jun 17, 2026

CVE-2020-9876 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8, watchOS 6.2.8, iTunes 12.10.8 for Windows, iCloud for Windows 11.3, iCloud for Windows 7.20. EPSS estimates a 1.95% chance of exploitation in the next 30 days.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8, watchOS 6.2.8, iTunes 12.10.8 for Windows, iCloud for Windows 11.3, iCloud for Windows 7.20. Opening a maliciously crafted PDF file may lead to an unexpected application termination or 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

1.95%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Apple	Icloud	< 7.20
Apple	Icloud	>= 10.0, < 11.5
Apple	Itunes	< 12.10.9
Apple	Ipados	< 14.0
Apple	Iphone Os	< 14.0
Apple	Mac Os X	>= 10.13, < 10.13.6
Apple	Mac Os X	>= 10.14, < 10.14.6
Apple	Mac Os X	>= 10.15, < 10.15.6
Apple	Mac Os X	10.13.6
Apple	Mac Os X	10.14.6
Apple	Macos	>= 11.0, <= 11.0.1
Apple	Tvos	< 14.0
Apple	Watchos	< 7.0

References

http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/19Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/20Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/22Mailing List, Third Party Advisory
https://support.apple.com/kb/HT211288Vendor Advisory
https://support.apple.com/kb/HT211289Vendor Advisory
https://support.apple.com/kb/HT211290Vendor Advisory
https://support.apple.com/kb/HT211291Vendor Advisory
https://support.apple.com/kb/HT211293Vendor Advisory
https://support.apple.com/kb/HT211294Vendor Advisory
https://support.apple.com/kb/HT211295Vendor Advisory
https://support.apple.com/kb/HT211843Vendor Advisory
https://support.apple.com/kb/HT211844Vendor Advisory
https://support.apple.com/kb/HT211850Vendor Advisory
https://support.apple.com/kb/HT211931Vendor Advisory
https://support.apple.com/kb/HT211935Vendor Advisory
https://support.apple.com/kb/HT211952Vendor Advisory
http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/19Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/20Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/22Mailing List, Third Party Advisory
https://support.apple.com/kb/HT211288Vendor Advisory
https://support.apple.com/kb/HT211289Vendor Advisory
https://support.apple.com/kb/HT211290Vendor Advisory
https://support.apple.com/kb/HT211291Vendor Advisory
https://support.apple.com/kb/HT211293Vendor Advisory
https://support.apple.com/kb/HT211294Vendor Advisory
https://support.apple.com/kb/HT211295Vendor Advisory
https://support.apple.com/kb/HT211843Vendor Advisory
https://support.apple.com/kb/HT211844Vendor Advisory
https://support.apple.com/kb/HT211850Vendor Advisory
https://support.apple.com/kb/HT211931Vendor Advisory
https://support.apple.com/kb/HT211935Vendor Advisory
https://support.apple.com/kb/HT211952Vendor Advisory

Timeline

Published: Oct 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9876?

How severe is CVE-2020-9876?

CVE-2020-9876 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.95% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9876?

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-2020-9876?

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

Scan your code now

Source: NVD / NIST