CVE-2021-1782

HIGH

CVSS Score

Published: April 2, 2021 at 05:59 PM UTC

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

5 products affected across 1 vendormacOSiPhone OSiPadOS

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Severity

HIGH7

Exploitation

CISA KEV

Exploit prediction

EPSS 2%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score2.2%

EPSS (Exploit Prediction Scoring System) estimates a 2.2% chance this CVE is exploited in the wild within the next 30 days — higher than 83% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Apple iOS, iPadOs, macOS, watchOS, and tvOS contain a race condition vulnerability that may allow a malicious application to elevate privileges.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Unknown

Added to KEV

Nov 3, 2021

Remediation Due

Nov 17, 2021

1809 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-1782

Description

A race condition was addressed with improved locking. 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 elevate privileges. Apple is aware of a report that this issue may have been actively exploited..

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 (5)

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

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1782

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHCISA-ADP

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

Vector?

Quick Info

StatusANALYZED

CWE

CWE-667

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