CVE-2021-1782: Apple Multiple Products Race Condition Vulnerability

CISA Known Exploited Vulnerabilities

Name

Apple Multiple Products Race Condition Vulnerability

Vendor

Apple

Product

Multiple Products

Added to the catalog

2021-11-03

Due date for US federal agencies

2021-11-17

Weaknesses

CWE-362, CWE-667

Catalog version

2026.10.30

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

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

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

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2021-04-02T18:15:21.373

Last modified

2026-06-17T03:32:33.030

Weaknesses

CWE-667

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..

References

• https://support.apple.com/en-us/HT212146 (Release Notes, Vendor Advisory)
• https://support.apple.com/en-us/HT212147 (Release Notes, Vendor Advisory)
• https://support.apple.com/en-us/HT212148 (Release Notes, Vendor Advisory)
• https://support.apple.com/en-us/HT212149 (Release Notes, Vendor Advisory)
• https://support.apple.com/en-us/HT212146 (Release Notes, Vendor Advisory)
• https://support.apple.com/en-us/HT212147 (Release Notes, Vendor Advisory)
• https://support.apple.com/en-us/HT212148 (Release Notes, Vendor Advisory)
• https://support.apple.com/en-us/HT212149 (Release Notes, Vendor Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1782 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:51.476Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-1782

CVE record

Assigner

apple

State

PUBLISHED

Published

2021-04-02T17:59:21.000Z

Updated

2025-10-21T23:25:50.291Z

Problem types

A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited.

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..

References

• https://support.apple.com/en-us/HT212147
• https://support.apple.com/en-us/HT212146
• https://support.apple.com/en-us/HT212148
• https://support.apple.com/en-us/HT212149

Read on 2026-11-03T01:05:34.077Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2021/1xxx/CVE-2021-1782.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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