CVE-2020-27893Network attack vector

Authenticated cross-user screen disclosure

Published Apr 2, 2021 · Updated Aug 4, 2024

Information disclosure in Screen Sharing in Apple macOS before 11.0.1 allows remote authenticated users to view another user's screen. Apple has not disclosed which Screen Sharing state transition is mishandled, stating only that improved state management resolves the issue. Screen Sharing access is required, and the reported consequence is limited to viewing another user's screen.

CVSS severity6.5
Medium
EPSS probability0.82%
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 Screen Sharing in Apple macOS before 11.0.1 allows remote authenticated users to view another user's screen. Apple has not disclosed which Screen Sharing state transition is mishandled, stating only that improved state management resolves the issue. Screen Sharing access is required, and the reported consequence is limited to viewing another user's screen.

The record

CVE
CVE-2020-27893
Published
Apr 2, 2021
Updated
Aug 4, 2024
Vendor
Apple
Product
macOS
Classifications
T1113
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 <11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Apple · macOSversion=unspecified <11.0

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1113Screen Capture

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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