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

CVSS: 7.0v3.1HighKEVAnalyzed
Published 02-04-2021Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2021-1782 is a high (CVSS 7.0) Improper Locking vulnerability in Apple Multiple Products. It is known to be exploited: CISA lists it, first on 03-11-2021. EPSS estimates a 2.22% chance of exploitation in the next 30 days, higher than 82.4% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
7.0/10
010
High · v3.1 (CVE.org)
EPSS score
2.22%
0%100%
Low · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-04-2021
    PublishedVulnerability first disclosed.
  2. 03-11-2021
    Added to CISA KEVApple Multiple Products Race Condition Vulnerability
  3. 17-11-2021
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

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..

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.22%

Chance of exploitation in the next 30 days

Percentile

82%

Versus all other CVEs

30-day change

0.00 pp

From 2.22% on 18-09-2026

18-09-202618-10-2026
EPSS score
2.22%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-11-2021
Federal due date
17-11-2021

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-1782

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apple7 products
  • ios and ipados≥ unspecified, < 14.4
  • ipados< 14.4
  • iphone_os< 14.4
  • mac_os_x≥ 10.14, < 10.14.6 | ≥ 10.15, < 10.15.7 | 10.14.6 | 10.14.6:security_update_2019-004 | 10.14.6:security_update_2019-005 | 10.14.6:security_update_2019-006 | 10.14.6:security_update_2019-007 | 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:security_update_2020-007 | 10.14.6:supplemental_update | 10.14.6:supplemental_update_2 | 10.15.7 | 10.15.7:supplemental_update
  • macos≥ unspecified, < 11.2 | ≥ unspecified, < 7.3 | ≥ unspecified, < 14.4 | ≥ 11.0, < 11.2

1 vendor · 7 products

References

5 links