Security readout for executives and security teams
Plain-English summary
CVE-2021-30897 is an Apple macOS issue where a malicious website could potentially leak information across origins through Resource Timing API behavior. Apple says the specification was updated and implemented, and the issue is fixed in macOS Monterey 12.0.1.
Executive priority
Treat this as a platform patching item with moderate business urgency. The impact is potential cross-origin data leakage from web browsing, but public evidence does not show active exploitation or severity scoring in the supplied sources.
Technical view
The vulnerability concerns Resource Timing API behavior that could allow cross-origin data exfiltration from a malicious website. The public record does not provide CVSS, CWE, affected version ranges, exploit details, or a standalone mitigation beyond Apple’s fixed macOS release.
Likely exposure
Exposure is most relevant to macOS endpoints that browse untrusted websites and have not applied the Apple update containing macOS Monterey 12.0.1 or equivalent vendor guidance.
Exploitation context
The provided sources do not indicate active exploitation, KEV listing, public exploit code, or observed campaigns. The stated attack context is a malicious website abusing browser-exposed timing behavior to exfiltrate cross-origin data.
Researcher notes
Evidence is sparse. The key technical detail is Resource Timing API specification behavior leading to possible cross-origin data exfiltration. The sources do not provide vulnerable version boundaries, proof-of-concept details, or indicators of exploitation.
Mitigation direction
- Update affected macOS systems to macOS Monterey 12.0.1 or later Apple-supported fixes.
- Review Apple security advisories for equivalent fixes on supported macOS release lines.
- Prioritize patching endpoints used for web browsing or access to sensitive web applications.
- Use browser and endpoint controls to reduce exposure to untrusted websites where feasible.
Validation and detection
- Inventory macOS endpoints and record exact OS versions.
- Confirm whether systems are running macOS Monterey 12.0.1 or later applicable Apple fixes.
- Check vulnerability management tooling for CVE-2021-30897 detection coverage.
- Review Apple advisories for any environment-specific affected-version details not present in the CVE record.
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-2021-30897 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/HT212814CVE reference · x_refsource_CONFIRM
- https://support.apple.com/kb/HT212815CVE reference · x_refsource_CONFIRM
- https://support.apple.com/en-us/HT212869CVE 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.