Security readout for executives and security teams
Plain-English summary
CVE-2021-30990 is a macOS Gatekeeper bypass. A malicious application could avoid Apple’s normal Gatekeeper checks, reducing a key protection that helps block untrusted apps. Apple fixed the issue in macOS Monterey 12.1, macOS Big Sur 11.6.2, and Security Update 2021-008 Catalina.
Executive priority
Treat this as a routine endpoint patching priority with elevated attention for fleets that allow local app installation. It weakens a major macOS trust control, but the provided sources do not establish active exploitation or remote compromise.
Technical view
Apple describes this as a logic issue addressed with improved validation. The documented impact is that a malicious application may bypass Gatekeeper checks. The source bundle does not provide CVSS, CWE, detailed affected version ranges, root-cause detail, or proof-of-concept information.
Likely exposure
Exposure is most likely on managed or unmanaged macOS endpoints that have not received Monterey 12.1, Big Sur 11.6.2, or Security Update 2021-008 Catalina. Exact affected version ranges are not specified in the provided sources.
Exploitation context
The provided bundle does not show known active exploitation, and KEV is false. The practical concern is local execution of a malicious application that avoids Gatekeeper enforcement, especially on endpoints where users can download or run untrusted software.
Researcher notes
The public detail is sparse. Apple names the impact and fixed releases but does not provide CVSS, CWE, affected build boundaries, exploit status, or technical internals in the supplied bundle. Avoid assuming more than a Gatekeeper bypass via a validation logic issue.
Mitigation direction
- Update Monterey systems to macOS 12.1 or later.
- Update Big Sur systems to macOS 11.6.2 or later.
- Apply Security Update 2021-008 on Catalina systems.
- Confirm Apple’s current guidance for unsupported macOS versions.
- Restrict untrusted app execution through endpoint management controls.
Validation and detection
- Inventory macOS versions across managed and unmanaged endpoints.
- Verify patch compliance against Apple’s fixed release versions.
- Review MDM reports for devices missing the relevant security update.
- Confirm Gatekeeper and application control policies remain enabled.
- Track exceptions where users can install or run unsigned software.
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-2021-30990 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/HT212978CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212979CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212981CVE 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.