CVE-2021-30803

Recent Contacts disclosure via flawed permission validation

Published Sep 8, 2021 · Updated Aug 3, 2024

Permissions bypass in Apple macOS Big Sur before 11.5 allows local users to read a user's recent Contacts through a malicious application. Identity Services insufficiently validates permissions when an application requests recent Contacts; Apple has not disclosed the exact failed check. Execution of a malicious application is required, and the documented consequence is limited to disclosure of the user's recent Contacts.

CVSS severity3.3
Low
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Permissions bypass in Apple macOS Big Sur before 11.5 allows local users to read a user's recent Contacts through a malicious application. Identity Services insufficiently validates permissions when an application requests recent Contacts; Apple has not disclosed the exact failed check. Execution of a malicious application is required, and the documented consequence is limited to disclosure of the user's recent Contacts.

The record

CVE
CVE-2021-30803
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
T1005
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 <11.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <11.5

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
3.3NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/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.

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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
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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