Security readout for executives and security teams
Plain-English summary
CVE-2021-30938 is a macOS issue where someone with local user access could crash the system or read kernel memory. Apple says it was fixed with improved checks in Monterey 12.1, Big Sur 11.6.2, and Security Update 2021-008 for Catalina.
Executive priority
Treat this as a routine but real endpoint patching priority. It is not sourced as internet-exploitable or actively exploited, but kernel memory exposure and local denial of service justify closing gaps on managed Macs, especially shared or privileged workstations.
Technical view
The public description gives limited internals: a local user may be able to cause unexpected system termination or read kernel memory. No CVSS, CWE, component, or exploit details are provided in the source bundle. Apple lists fixed macOS releases and describes the remediation as improved checks.
Likely exposure
Exposure is macOS systems not updated to Monterey 12.1, Big Sur 11.6.2, or Catalina Security Update 2021-008. Risk is more relevant on shared Macs, developer workstations, kiosks, or environments where untrusted users can obtain local accounts.
Exploitation context
The provided sources do not state active exploitation, and CISA KEV status is false. The known prerequisite is local user access. Business impact is potential system disruption or unauthorized kernel memory disclosure, but public evidence is incomplete on reliability or affected component.
Researcher notes
Public data is sparse: no CVSS, CWE, vulnerable component, or affected version range beyond Apple fixed releases. Avoid assuming exploitability beyond local access. Validation should focus on OS version compliance and local-user exposure rather than exploit reproduction.
Mitigation direction
- Update Monterey systems to macOS Monterey 12.1 or later.
- Update Big Sur systems to macOS Big Sur 11.6.2 or later.
- Apply Security Update 2021-008 on supported Catalina systems.
- Review Apple security guidance for unsupported or newer macOS branches.
- Restrict local account access on shared or high-value Macs.
Validation and detection
- Inventory macOS versions across managed endpoints.
- Confirm patch records show the relevant fixed Apple release or later.
- Identify Macs still running Catalina, Big Sur, or Monterey below fixed levels.
- Review endpoint controls limiting local accounts and privilege escalation paths.
- Track exceptions for unsupported Macs requiring replacement or isolation.
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-2021-30938 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.