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TI-2020-16977 Aliases CVE-2020-27921GHSA-9853-89f8-q3cw

Race condition in Apple macOS

Priority LOW 32CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

A race condition was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, macOS Big Sur 11.0.1. An application may be able to execute arbitrary code with kernel privileges.

Why it matters now

EPSS 0.00771 55th percentileScored 2026-11-07
Fix Fixed macOS (Apple): 11.0, 11.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApplemacOSbefore 11.011.0Patch availableCNA
ApplemacOSbefore 11.111.1Patch availableCNA
  • macOS VendorApple Affected before 11.0 Fixed in 11.0 Patch available CNA
  • macOS VendorApple Affected before 11.1 Fixed in 11.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*before 11.0.1; before 11.1.0VulnerableApple
  • cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* Versions before 11.0.1; before 11.1.0 Vulnerable ·Apple

Remediation

  • Fix · CNA macOS (Apple) Fixed in 11.0
  • Fix · CNA macOS (Apple) Fixed in 11.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apple macOS 11.1

    48 records Highest priority Priority MEDIUM 2 MEDIUM, 46 LOW

    Other records, highest priority first

    • TI-2020-16976 Use after free in Apple watchOSPriority MEDIUM 41
    • TI-2020-17807 Apple macOS: An attacker in a privileged network position may be able to bypass…Priority MEDIUM 40
    • TI-2020-08038 Out-of-bounds write in Apple tvOSPriority LOW 39
    Show all 48 records →
  • Release ·

    Apple macOS 11.0

    31 records Highest priority Priority MEDIUM 1 MEDIUM, 30 LOW

    Other records, highest priority first

    Show all 31 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27921
  2. 2026-10-03 Alias added: GHSA-9853-89f8-q3cw

References

Advisory 2

  • TI-2021-01573 Apple iOS and iPadOS: A remote attacker may be able to cause arbitrary code execution KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-01572 Apple iOS and iPadOS: A remote attacker may be able to cause arbitrary code execution KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2012-01607 sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI… KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-02117 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3209 →

Sources

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