CVE-2020-3909

CRITICAL

9.8

CVSS Score

Published: April 1, 2020 at 05:53 PM UTC

Updated: June 17, 2026 at 03:19 AM UTC

8 products affected across 2 vendorsmacOSiPhone OSiPadOS

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Severity

CRITICAL9.8

Exploit prediction

EPSS 3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

iCloud · Apple

95%

v < 7.18v < iCloud for Windows 10.9.3v < iCloud for Windows 7.1810.9 ≤ v < 10.9.3

Affected range stops below 10.9.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.18, so it looks safe — our inference, not a vendor statement

Affected range stops below iCloud for Windows 10.9.3, so it looks safe — our inference, not a vendor statement

Affected range stops below iCloud for Windows 7.18, so it looks safe — our inference, not a vendor statement

iPadOS · Apple

95%

v < 13.4

Affected range stops below 13.4, so it looks safe — our inference, not a vendor statement

iPhone OS · Apple

95%

v < 13.4v < iOS 13.4 and iPadOS 13.4

Affected range stops below 13.4, so it looks safe — our inference, not a vendor statement

Affected range stops below iOS 13.4 and iPadOS 13.4, so it looks safe — our inference, not a vendor statement

iTunes · Apple

95%

v < 12.10.5v < iTunes for Windows 12.10.5

Affected range stops below 12.10.5, so it looks safe — our inference, not a vendor statement

Affected range stops below iTunes for Windows 12.10.5, so it looks safe — our inference, not a vendor statement

macOS · Apple

95%

v < 10.15.4v < macOS Catalina 10.15.4

Affected range stops below 10.15.4, so it looks safe — our inference, not a vendor statement

Affected range stops below macOS Catalina 10.15.4, so it looks safe — our inference, not a vendor statement

tvOS · Apple

95%

v < 13.4v < tvOS 13.4

Affected range stops below 13.4, so it looks safe — our inference, not a vendor statement

Affected range stops below tvOS 13.4, so it looks safe — our inference, not a vendor statement

watchOS · Apple

95%

v < 6.2v < watchOS 6.2

Affected range stops below 6.2, so it looks safe — our inference, not a vendor statement

Affected range stops below watchOS 6.2, so it looks safe — our inference, not a vendor statement

Sun Zfs Storage Appliance Kit Software · Oracle

95%

8.8

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references