Security readout for executives and security teams
Plain-English summary
CVE-2021-30904 is a macOS privacy issue involving iMessage. Apple says a user’s messages could continue syncing after the user signed out of iMessage. The fix was included in macOS Monterey 12.0.1 by improving state validation.
Executive priority
Treat this as a privacy and data-governance issue. It should be prioritized for managed Macs that handle sensitive communications, but current sources do not support emergency response language or active-exploitation claims.
Technical view
The CVE describes a synchronization state issue in macOS where iMessage sign-out did not reliably stop message syncing. Apple addressed it with improved state validation in macOS Monterey 12.0.1. Public sources do not provide CVSS, CWE, attack requirements, or exact affected macOS versions.
Likely exposure
Exposure appears limited to Apple macOS systems using iMessage where users sign out and expect syncing to stop. The source bundle does not identify specific vulnerable macOS builds beyond stating the issue is fixed in macOS Monterey 12.0.1.
Exploitation context
There is no KEV entry and no cited source in the bundle reports active exploitation. The public description supports a privacy and account-state risk, not confirmed remote code execution or broad compromise.
Researcher notes
The available evidence is sparse: no CVSS, CWE, exploitability details, or exact vulnerable version range are provided. Keep analysis tied to Apple’s advisory and the CVE description, and avoid inferring attacker model or exploitation status.
Mitigation direction
- Update eligible Macs to macOS Monterey 12.0.1 or later.
- Review Apple’s security advisory for any additional vendor guidance.
- Prioritize managed Macs where iMessage use is allowed.
- Confirm offboarding processes include Apple ID and iMessage sign-out checks.
Validation and detection
- Inventory macOS versions across managed endpoints.
- Confirm affected systems are on macOS Monterey 12.0.1 or later.
- Review device management records for iMessage-enabled Macs.
- Validate account offboarding procedures stop message access and syncing.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-30904 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/HT212869CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.