CVE-2021-1824

Root-level private-information disclosure via insufficient Login Window entitlements

Published Sep 8, 2021 · Updated Aug 3, 2024

Information disclosure in Login Window in Apple macOS allows local users with root privileges to read private information. Login Window applies insufficient entitlements, allowing a root-privileged malicious application to cross the intended private-data access boundary. Apple has not disclosed the affected entitlement or the specific private information exposed, so the consequence is limited to local confidentiality loss.

CVSS severity4.4
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Login Window in Apple macOS allows local users with root privileges to read private information. Login Window applies insufficient entitlements, allowing a root-privileged malicious application to cross the intended private-data access boundary. Apple has not disclosed the affected entitlement or the specific private information exposed, so the consequence is limited to local confidentiality loss.

The record

CVE
CVE-2021-1824
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-668, T1005
Attack vector
local
Privileges
admin

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 <11.3
  2. Affected versionversion=unspecified <2021

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Apple · macOSversion=unspecified <11.3; version=unspecified <2021

Published CVSS scores

4.4NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
4.9NIST National Vulnerability DatabaseAV:L/AC:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
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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