Security readout for executives and security teams
Plain-English summary
This macOS flaw could let an application run code with kernel privileges, the highest local privilege level on a Mac. Apple says it fixed the out-of-bounds write with improved bounds checking in Big Sur and Catalina/Mojave security updates. Treat unpatched Macs as high priority, especially where users can run third-party applications.
Executive priority
Prioritize remediation for business-managed Macs because successful exploitation could give an application kernel-level control. Urgency is driven by privilege level and endpoint exposure, not confirmed exploitation in the provided sources.
Technical view
CVE-2020-27897 is an Apple macOS out-of-bounds write vulnerability. The documented impact is arbitrary code execution with kernel privileges by an application. Public sources do not provide CVSS, CWE, affected component details, or exact vulnerable version ranges beyond macOS and the fixed Apple releases.
Likely exposure
Exposure is likely limited to Apple macOS systems missing macOS Big Sur 11.0.1 or 11.1, Security Update 2020-001 Catalina, or Security Update 2020-007 Mojave. The source bundle does not specify exact vulnerable build ranges.
Exploitation context
The provided sources do not state active exploitation, and the CVE is not listed as KEV in the bundle. The stated attacker position is an application capable of triggering kernel-privileged code execution, but no exploit path is described.
Researcher notes
Public detail is sparse. ZDI and Apple identify the issue class and impact, but the bundle does not provide component internals, root cause specifics, CVSS, exploit maturity, or affected build ranges. Avoid assuming broader Apple platforms are affected.
Mitigation direction
- Apply the fixed Apple macOS release or security update for the installed major version.
- Prioritize managed Macs where users can install or run untrusted applications.
- Check Apple advisories for any newer superseding macOS security updates.
- Use normal endpoint controls to reduce execution of untrusted applications until patched.
Validation and detection
- Inventory macOS versions and build levels across managed endpoints.
- Confirm Big Sur systems are at 11.0.1, 11.1, or later supported updates.
- Confirm Catalina systems include Security Update 2020-001 or later superseding updates.
- Confirm Mojave systems include Security Update 2020-007 or later superseding updates.
- Review vulnerability scanner findings against Apple’s fixed-version guidance.
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-2020-27897 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/HT211931CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212011CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-486/CVE 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.