CVE-2021-30850

Protected-file disclosure to local users

Published Oct 19, 2021 · Updated Aug 3, 2024

Sandbox access-control failure in Apple macOS Big Sur before 11.6 allows local users to read protected filesystem content. The flaw is in Sandbox access restrictions, but Apple has not published the incorrect access-control operation or protected path involved. Exploitation is local and requires user interaction; Catalina without Security Update 2021-005 is also affected, with no reported write or service impact.

CVSS severity5.5
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox access-control failure in Apple macOS Big Sur before 11.6 allows local users to read protected filesystem content. The flaw is in Sandbox access restrictions, but Apple has not published the incorrect access-control operation or protected path involved. Exploitation is local and requires user interaction; Catalina without Security Update 2021-005 is also affected, with no reported write or service impact.

The record

CVE
CVE-2021-30850
Published
Oct 19, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 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 <15
  3. Affected versionversion=unspecified <2021

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <11.6; version=unspecified <15; version=unspecified <2021

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
7.1NVDAV:N/AC:M/Au:N/C:C/I:N/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

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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