CVE-2020-9956

HIGH

7.8

CVSS Score

Published: April 2, 2021 at 05:23 PM UTC

Updated: June 17, 2026 at 03:28 AM UTC

5 products affected across 1 vendormacOSiPhone OSiPadOS

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Severity

HIGH7.8

Exploit prediction

EPSS 1%

Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, tvOS 14.0, macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, watchOS 7.0, iOS 14.0 and iPadOS 14.0. Processing a maliciously crafted font file may lead to arbitrary code execution.

Affected

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

iPadOS · Apple

95%

v < 14.0v < 14.0.

Affected range stops below 14.0., so it looks safe — our inference, not a vendor statement

iPhone OS · Apple

95%

v < 14.0

Affected range stops below 14.0, so it looks safe — our inference, not a vendor statement

macOS · Apple

95%

v < 11.0v < 11.110.14 ≤ v < 10.14.610.15 ≤ v < 10.15.711.0 ≤ v < 11.1.010.14.6 10.14.6 security_update_2019-001 10.14.6 security_update_2019-002 10.14.6 security_update_2020-001 10.14.6 security_update_2020-002 10.14.6 security_update_2020-003 10.14.6 security_update_2020-004 10.14.6 security_update_2020-005 10.14.6 security_update_2020-006 10.14.6 supplemental_update 10.14.6 supplemental_update_2 10.15.7 10.15.7 supplemental_update

Affected range stops below 10.14.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.15.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.1.0, so it looks safe — our inference, not a vendor statement

tvOS · Apple

95%

v < 14.0

Affected range stops below 14.0, so it looks safe — our inference, not a vendor statement

watchOS · Apple

95%

v < 7.0

Affected range stops below 7.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references