CVE-2021-30715

Service interruption via malformed message state handling

Published Sep 8, 2021 · Updated Aug 3, 2024

A logic error in the kernel of Apple iOS, iPadOS, and macOS allows attackers to interrupt service via a maliciously crafted message. Apple states that kernel message processing used incorrect state management but has not published the faulty state transition or operation. The crafted message must reach kernel processing; the documented consequence is denial of service, with no reported data access or code execution.

CVSS severityUnavailable
Unscored
EPSS probability1.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A logic error in the kernel of Apple iOS, iPadOS, and macOS allows attackers to interrupt service via a maliciously crafted message. Apple states that kernel message processing used incorrect state management but has not published the faulty state transition or operation. The crafted message must reach kernel processing; the documented consequence is denial of service, with no reported data access or code execution.

The record

CVE
CVE-2021-30715
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

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 <14.6

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Apple · iOS and iPadOSversion=unspecified <14.6
Apple · macOSversion=unspecified <11.4; version=unspecified <14.6; version=unspecified <2021; version=unspecified <7.5

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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