CVE-2021-1806

Kernel code execution via graphics-driver race

Published Apr 2, 2021 · Updated Aug 3, 2024

Race condition in Apple macOS before 11.2 allows local users to execute arbitrary code with kernel privileges via a malicious application. The Intel Graphics Driver performs an inadequately synchronized operation on shared state; Apple discloses no further implementation detail beyond additional validation. Triggering the flaw requires a local application and can compromise the kernel, while no network reachability is described.

CVSS severity7.0
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in Apple macOS before 11.2 allows local users to execute arbitrary code with kernel privileges via a malicious application. The Intel Graphics Driver performs an inadequately synchronized operation on shared state; Apple discloses no further implementation detail beyond additional validation. Triggering the flaw requires a local application and can compromise the kernel, while no network reachability is described.

The record

CVE
CVE-2021-1806
Published
Apr 2, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-362, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <11.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <11.2

Published CVSS scores

7.0NVDCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.6NVDAV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo