CVE-2020-3909

critical

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.

References

https://www.oracle.com/security-alerts/cpuoct2020.html

https://support.apple.com/HT211107

https://support.apple.com/HT211106

https://support.apple.com/HT211105

https://support.apple.com/HT211103

https://support.apple.com/HT211102

https://support.apple.com/HT211101

https://support.apple.com/HT211100

https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-25174

Details

Source: Mitre, NVD

Published: 2020-04-01

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.03039