CVE-2021-30667

Adjacent Wi-Fi authentication downgrade

Published Sep 8, 2021 · Updated Aug 3, 2024

Improper authentication in Wi-Fi in Apple iOS and iPadOS before 14.6 allows physically proximate attackers to force weaker authentication. Apple has not disclosed the failed validation check or the Wi-Fi authentication negotiation state affected by the logic error. The attacker must be within Wi-Fi range, and the documented consequence is limited to forcing a less secure authentication mechanism.

CVSS severity5.4
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Wi-Fi in Apple iOS and iPadOS before 14.6 allows physically proximate attackers to force weaker authentication. Apple has not disclosed the failed validation check or the Wi-Fi authentication negotiation state affected by the logic error. The attacker must be within Wi-Fi range, and the documented consequence is limited to forcing a less secure authentication mechanism.

The record

CVE
CVE-2021-30667
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-287, T1557
Attack vector
adjacent
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 <14.6

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <14.6

Published CVSS scores

4.8NIST NVDAV:A/AC:L/Au:N/C:P/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
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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