Security readout for executives and security teams
Plain-English summary
CVE-2021-30935 is an Apple macOS issue where an application may execute arbitrary code with kernel privileges. In business terms, compromise of an affected Mac could become full device-level compromise. Apple says the logic issue was fixed with improved validation.
Executive priority
Treat this as a high-priority endpoint patching issue for older macOS fleets. There is no sourced evidence of active exploitation in the bundle, but kernel-level code execution raises the potential business impact if an affected Mac is compromised.
Technical view
Apple describes a logic issue in macOS that could allow an application to execute arbitrary code with kernel privileges. The source bundle does not identify the specific component, CWE, CVSS score, or prerequisite conditions. Fixes are named for Security Update 2021-008 Catalina and macOS Big Sur 11.6.2.
Likely exposure
Exposure is likely limited to macOS systems that have not received the named Apple security updates. The bundle lists affected Apple macOS versions as unspecified, so inventory should focus on Catalina and Big Sur systems below the fixed update levels and any vendor-linked macOS advisory scope.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. The impact is still serious because kernel privileges can bypass normal operating-system protections once an application reaches the vulnerable path.
Researcher notes
Evidence is sparse. Apple provides impact and fixed versions, but the bundle lacks component details, root cause depth, CVSS, CWE, exploit maturity, and detection indicators. Avoid assuming remote exploitability or active exploitation without additional vendor or threat-intelligence evidence.
Mitigation direction
- Apply Security Update 2021-008 on macOS Catalina systems.
- Update macOS Big Sur systems to 11.6.2 or later.
- Check Apple advisories for any additional affected macOS releases.
- Prioritize managed Macs that run untrusted or third-party applications.
Validation and detection
- Inventory macOS versions across managed endpoints.
- Confirm Catalina systems have Security Update 2021-008 installed.
- Confirm Big Sur systems are on 11.6.2 or later.
- Review EDR telemetry for suspicious local privilege escalation behavior.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-30935 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/kb/HT212978CVE reference · x_refsource_CONFIRM
- 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.