CVE-2021-30987

Passive device tracking via BSSID exposure

Published Aug 24, 2021 · Updated Aug 3, 2024

An access-control issue in Apple macOS Monterey before 12.1 allows local users to passively track a device via exposed BSSIDs. The Airport component applied insufficient access restrictions around BSSID information, permitting a local low-privilege application to obtain identifiers useful for tracking network presence. The impact is indirect confidentiality loss through passive observation; no device modification or service interruption is described.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An access-control issue in Apple macOS Monterey before 12.1 allows local users to passively track a device via exposed BSSIDs. The Airport component applied insufficient access restrictions around BSSID information, permitting a local low-privilege application to obtain identifiers useful for tracking network presence. The impact is indirect confidentiality loss through passive observation; no device modification or service interruption is described.

The record

CVE
CVE-2021-30987
Published
Aug 24, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-863, T1016
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 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 <12.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · macOSversion=unspecified <12.1

Published CVSS scores

2.1NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NVDCVSS:3.1/AV:L/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

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1016System Network Configuration Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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