CVE-2021-30727

Protected filesystem modification via Crash Reporter state error

Published Sep 8, 2021 · Updated Aug 3, 2024

Logic error in Apple Crash Reporter before iOS and iPadOS 14.6 or macOS 11.4 allows local users to modify protected files. Crash Reporter incorrectly manages internal state, but Apple has not disclosed the affected function or state transition that permits writes into protected filesystem locations. Exploitation requires a malicious application to run locally with user interaction; the established consequence is unauthorized filesystem modification, not code execution.

CVSS severity5.5
Medium
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Logic error in Apple Crash Reporter before iOS and iPadOS 14.6 or macOS 11.4 allows local users to modify protected files. Crash Reporter incorrectly manages internal state, but Apple has not disclosed the affected function or state transition that permits writes into protected filesystem locations. Exploitation requires a malicious application to run locally with user interaction; the established consequence is unauthorized filesystem modification, not code execution.

The record

CVE
CVE-2021-30727
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1404, T1068
Attack vector
local
Privileges
unauthenticated

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 vectorlocal
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1404Exploitation for Privilege Escalation
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

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Your stack

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