CVE-2021-30781

Local code execution via undisclosed Audio checks

Published Sep 8, 2021 · Updated Aug 3, 2024

Improper checks in Apple's Audio component in iOS before 14.7 and macOS before 11.5 allow local users to crash apps or execute code. Apple identifies the affected locus only as Audio and has not published which checks mishandle attacker-controlled input. Exploitation requires local access and can terminate an application or run code in its context; no higher privilege impact is documented.

CVSS severity7.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper checks in Apple's Audio component in iOS before 14.7 and macOS before 11.5 allow local users to crash apps or execute code. Apple identifies the affected locus only as Audio and has not published which checks mishandle attacker-controlled input. Exploitation requires local access and can terminate an application or run code in its context; no higher privilege impact is documented.

The record

CVE
CVE-2021-30781
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS
Classifications
T1203
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 <14.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · iOSversion=unspecified <14.7
Apple · Security Update Catalinaversion=unspecified <2021
Apple · macOSversion=unspecified <11.5; version=unspecified <14.7; version=unspecified <2021; version=unspecified <7.6

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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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

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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