CVE-2021-30982Network attack vector

Application crash or heap corruption via race

Published Aug 24, 2021 · Updated Aug 3, 2024

A race condition in IOUSBHostFamily in Apple macOS allows remote attackers to crash applications or corrupt heap memory. IOUSBHostFamily accesses shared state without sufficient locking, but Apple has not published the affected function or request path. Network reachability is required; successful triggering terminates an application or corrupts its heap, with no published code-execution impact.

CVSS severity7.5
High
EPSS probability1.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in IOUSBHostFamily in Apple macOS allows remote attackers to crash applications or corrupt heap memory. IOUSBHostFamily accesses shared state without sufficient locking, but Apple has not published the affected function or request path. Network reachability is required; successful triggering terminates an application or corrupts its heap, with no published code-execution impact.

The record

CVE
CVE-2021-30982
Published
Aug 24, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-362, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 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 <11.6
  2. Affected versionversion=unspecified <12.1
  3. Affected versionversion=unspecified <2021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <11.6; version=unspecified <12.1; version=unspecified <2021

Published CVSS scores

4.0NISTAV:N/AC:M/Au:N/C:N/I:N/A:P
7.5NISTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499Endpoint Denial of Service

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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