CVE-2021-1791

MEDIUM

5.5

CVSS Score

Published: April 2, 2021 at 06:01 PM UTC

Updated: June 17, 2026 at 03:32 AM UTC

5 products affected across 1 vendormacOSiPhone OSiPadOS

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Severity

MEDIUM5.5

Exploit prediction

EPSS 1%

Description

An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to disclose kernel memory.

Affected

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

iPadOS · Apple

95%

v < 14.4

Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement

iPhone OS · Apple

95%

v < 14.4

Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement

macOS · Apple

95%

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 11.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3, so it looks safe — our inference, not a vendor statement

tvOS · Apple

95%

v < 14.4

Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement

watchOS · Apple

95%

v < 7.3

Affected range stops below 7.3, 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

References (4)

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212146

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212147

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212148

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212149

CVSS

5.5MEDIUM[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-125

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