CVE-2020-3911

Name: CVE-2020-3911
Creator: NVD / NIST
Published: 2020-04-01T18:15:17.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.64%

Last modified Jun 17, 2026

CVE-2020-3911 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 13.4 and iPadOS 13.4, macOS Catalina 10.15.4, tvOS 13.4, watchOS 6.2, iTunes for Windows 12.10.5, iCloud for Windows 10.9.3, iCloud for Windows 7.18. EPSS estimates a 1.64% chance of exploitation in the next 30 days.

Description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 13.4 and iPadOS 13.4, macOS Catalina 10.15.4, tvOS 13.4, watchOS 6.2, iTunes for Windows 12.10.5, iCloud for Windows 10.9.3, iCloud for Windows 7.18. Multiple issues in libxml2.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.64%

73.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Apple	Icloud	< 10.9.3
Apple	Itunes	< 12.10.5
Apple	Ipados	< 13.4
Apple	Iphone Os	< 13.4
Apple	Mac Os X	< 10.15.4
Apple	Tvos	< 13.4
Apple	Watchos	< 6.2

References

https://support.apple.com/HT211100Vendor Advisory
https://support.apple.com/HT211101Vendor Advisory
https://support.apple.com/HT211102Vendor Advisory
https://support.apple.com/HT211103Vendor Advisory
https://support.apple.com/HT211105Vendor Advisory
https://support.apple.com/HT211106Vendor Advisory
https://support.apple.com/HT211107Vendor Advisory
https://support.apple.com/HT211100Vendor Advisory
https://support.apple.com/HT211101Vendor Advisory
https://support.apple.com/HT211102Vendor Advisory
https://support.apple.com/HT211103Vendor Advisory
https://support.apple.com/HT211105Vendor Advisory
https://support.apple.com/HT211106Vendor Advisory
https://support.apple.com/HT211107Vendor Advisory

Timeline

Published: Apr 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3911?

How severe is CVE-2020-3911?

CVE-2020-3911 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.64% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3911?

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-2020-3911?

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

Scan your code now

Source: NVD / NIST