CVE-2020-29633Network attack vector

Authentication policy bypass via Login Window state mishandling

Published Apr 2, 2021 · Updated Aug 4, 2024

Authentication bypass in Login Window in affected Apple macOS releases allows man-in-the-middle attackers to bypass authentication policy. Login Window mishandles authentication state during network-positioned interactions; Apple has not disclosed the exact state transition or policy check. Exploitation requires a privileged network position, and the documented consequence is limited to bypassing the applicable authentication policy.

CVSS severity8.8
High
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Login Window in affected Apple macOS releases allows man-in-the-middle attackers to bypass authentication policy. Login Window mishandles authentication state during network-positioned interactions; Apple has not disclosed the exact state transition or policy check. Exploitation requires a privileged network position, and the documented consequence is limited to bypassing the applicable authentication policy.

The record

CVE
CVE-2020-29633
Published
Apr 2, 2021
Updated
Aug 4, 2024
Vendor
Apple
Product
macOS
Classifications
T1557
Attack vector
network
Privileges
Unavailable

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 <11.1
  2. Affected versionversion=unspecified <11.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Apple · macOSversion=unspecified <11.1; version=unspecified <11.2

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1557Adversary-in-the-Middle

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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