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CVE Record

CVE-2021-30966: A logic issue was addressed with improved state management.

A logic issue was addressed with improved state management. This issue is fixed in macOS Monterey 12.1, watchOS 8.3, iOS 15.2 and iPadOS 15.2, tvOS 15.2. User traffic might unexpectedly be leaked to a proxy server despite PAC configurations.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-30966 is an Apple logic flaw where user traffic could be sent to a proxy server even when PAC settings should prevent that. The main business concern is unintended exposure of browsing or network activity. Apple fixed it in macOS Monterey 12.1, watchOS 8.3, iOS/iPadOS 15.2, and tvOS 15.2.

Executive priority

Prioritize remediation where Apple devices handle sensitive traffic or rely on PAC rules for privacy or network control. This is not KEV-listed in the provided sources, but the confidentiality impact makes timely patch verification appropriate.

Technical view

Apple describes a logic issue corrected with improved state management. The impact is proxy behavior bypassing expected PAC configuration, causing user traffic to be unexpectedly leaked to a proxy server. Affected version ranges are not specified in the source bundle, but fixed versions are listed across Apple platforms.

Likely exposure

Organizations using Apple devices with proxy auto-configuration policies are the most relevant exposure group, especially where PAC rules enforce privacy, routing, monitoring boundaries, or network segmentation. Exposure is likely limited to devices below the listed fixed OS versions, but exact affected versions are not provided.

Exploitation context

The source bundle does not show CISA KEV listing, public active exploitation, exploit code, or attacker prerequisites. The practical risk is misrouting or disclosure of user traffic to a proxy server despite intended PAC policy, not confirmed remote compromise.

Researcher notes

Key unknowns are affected version boundaries, CVSS severity, exploitability conditions, and whether leakage requires specific PAC or proxy configurations. Validation should focus on managed Apple fleets, PAC-dependent routing, and confirmation of fixed OS versions rather than speculative exploit testing.

Mitigation direction

  • Update macOS Monterey devices to 12.1 or later.
  • Update iPhones and iPads to iOS/iPadOS 15.2 or later.
  • Update Apple Watch devices to watchOS 8.3 or later.
  • Update Apple TV devices to tvOS 15.2 or later.
  • Check Apple guidance for any platform-specific deployment notes.

Validation and detection

  • Inventory Apple device OS versions against the fixed releases.
  • Identify environments relying on PAC files for traffic routing controls.
  • Review proxy logs for unexpected Apple-device traffic paths.
  • Confirm managed devices received the relevant Apple security updates.
  • Document any unsupported Apple devices that cannot be updated.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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CVE-2021-30966 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
ApplewatchOSunspecifiedListed
AppleiOS and iPadOSunspecifiedListed
ApplemacOSunspecifiedListed
ApplemacOSunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.