CVE-2021-30676

Kernel-memory disclosure or system crash via state flaw

Published Sep 8, 2021 · Updated Aug 3, 2024

A logic flaw in the AMD component of Apple macOS allows local users to read kernel memory or cause unexpected system termination. Apple identifies faulty state management in the AMD component but has not published the operation or state transition that mishandles input. Exploitation requires local access; reported consequences are limited to kernel-memory disclosure or a system crash, with no integrity impact.

CVSS severity7.1
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A logic flaw in the AMD component of Apple macOS allows local users to read kernel memory or cause unexpected system termination. Apple identifies faulty state management in the AMD component but has not published the operation or state transition that mishandles input. Exploitation requires local access; reported consequences are limited to kernel-memory disclosure or a system crash, with no integrity impact.

The record

CVE
CVE-2021-30676
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
T1499.004, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <11.4
  2. Affected versionversion=unspecified <2021

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · macOSversion=unspecified <11.4; version=unspecified <2021

Published CVSS scores

6.6NIST NVDAV:L/AC:L/Au:N/C:C/I:N/A:C
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation
T1005Data from Local System

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

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Your stack

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