Security readout for executives and security teams
Plain-English summary
CVE-2021-30853 is an Apple macOS Gatekeeper bypass. Apple says a malicious application may bypass Gatekeeper checks, and the issue was fixed in macOS Big Sur 11.6. Public source detail is limited, so exposure should be managed through patch verification rather than assumptions about exploitation.
Executive priority
Treat this as a patch verification item for macOS fleets, not a confirmed emergency. The business concern is reduced protection against malicious apps if endpoints remain unpatched.
Technical view
The issue affects Apple macOS and concerns insufficient Gatekeeper checking. Apple describes the remediation as improved checks and identifies macOS Big Sur 11.6 as the fixed release. No CVSS, CWE, detailed affected version range, or exploit mechanics are provided in the supplied sources.
Likely exposure
Likely exposure is macOS endpoints running vulnerable builds, especially Big Sur systems before 11.6. The supplied sources do not define all affected macOS versions or configurations.
Exploitation context
The supplied sources state that a malicious application may bypass Gatekeeper checks. They do not show CISA KEV listing, active exploitation, public exploit availability, or attack prerequisites beyond malicious application execution.
Researcher notes
Evidence is sparse. Apple confirms the security impact and fixed Big Sur release, but not root cause, CVSS, CWE, exploit status, or complete affected-version boundaries. Avoid making claims beyond Gatekeeper bypass risk.
Mitigation direction
- Update macOS Big Sur systems to 11.6 or a fixed supported release.
- Check Apple guidance for equivalent fixes on other macOS branches.
- Prioritize managed endpoints that allow user-installed applications.
- Keep Gatekeeper and application control policies enabled where applicable.
Validation and detection
- Inventory macOS endpoints and identify Big Sur systems below 11.6.
- Confirm endpoint patch status against Apple security update records.
- Review Apple advisories for any broader affected-version clarification.
- Check security telemetry for suspicious untrusted application launches.
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-2021-30853 mapping review
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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/HT212804CVE 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.