CVE-2021-1782

Q: How do I fix CVE-2021-1782?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2021-1782 being actively exploited?

Yes. CVE-2021-1782 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2021-11-17. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2021-1782?

CVE-2021-1782 has a CVSS v3 base score of 7.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-1782 affect?

Published advisories record a fix for ipados (NVD), iphone os (NVD), mac os x (NVD), macos (NVD), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGHCISA KEVEPSS 81th pctl

7.0

CVSS v3

NVD

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..

CWE-667

How to fix

Remediation Available

ipadosNVD

Affected:< 14.4Fixed in:14.4CVE-2021-1782derived from NVD

iphone osNVD

Affected:< 14.4Fixed in:14.4CVE-2021-1782derived from NVD

mac os xNVD

Affected:>= 10.15, < 10.15.7Fixed in:10.15.7CVE-2021-1782derived from NVD

macosNVD

Affected:>= 11.0, < 11.2Fixed in:11.2CVE-2021-1782derived from NVD

tvosNVD

Affected:< 14.4Fixed in:14.4CVE-2021-1782derived from NVD

watchosNVD

Affected:< 7.3Fixed in:7.3CVE-2021-1782derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.22%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Apple Multiple Products Race Condition Vulnerability

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

Apply updates per vendor instructions.

Remediation due: 2021-11-17

References

Vendor Advisory4

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-667 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-10072	High	7.5	73%	-	Fix
CVE-2002-1850	High	7.5	17%	-	Fix
CVE-2009-2699	High	7.5	14%	-	Fix
CVE-2004-0174	High	7.5	12%	-	-
CVE-2009-4272	High	7.5	11%	-	-
CVE-2020-24606	High	8.6	5.2%	-	Fix

Common questions

How do I fix CVE-2021-1782?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-1782 being actively exploited?

Yes. CVE-2021-1782 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2021-11-17. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2021-1782?

CVE-2021-1782 has a CVSS v3 base score of 7.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-1782 affect?

Published advisories record a fix for ipados (NVD), iphone os (NVD), mac os x (NVD), macos (NVD), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-1782

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-23.