Security readout for executives and security teams
Plain-English summary
This Apple issue could let a malicious USD file expose memory contents when processed on affected iOS, iPadOS, or macOS systems. Apple says the problem was a buffer overflow and fixed it with improved memory handling in December 2021 security updates.
Executive priority
Treat this as a patch compliance issue for Apple fleets, not a known active exploitation emergency. Prioritize creative, design, or content-processing users who may handle USD files, then close remaining legacy macOS exposure.
Technical view
CVE-2021-30940 is a buffer overflow triggered by processing a maliciously crafted USD file. The documented impact is memory disclosure. Apple fixed it in iOS 15.2, iPadOS 15.2, macOS Monterey 12.1, macOS Big Sur 11.6.2, and Security Update 2021-008 Catalina.
Likely exposure
Exposure is most likely on Apple endpoints below the fixed versions, especially systems that open or process USD files. The source bundle does not identify exact vulnerable build ranges, affected components, or whether server-side Apple software is involved.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked KEV. A practical attack would require a target system to process a malicious USD file. Public details do not establish reliability, attack complexity, or any broader impact beyond memory disclosure.
Researcher notes
Primary evidence is sparse. Apple describes the flaw as a buffer overflow fixed by improved memory handling, with memory disclosure from malicious USD processing. The bundle lacks CVSS, CWE, vulnerable build ranges, affected component names, and exploit telemetry.
Mitigation direction
- Upgrade iOS and iPadOS devices to 15.2 or later.
- Upgrade macOS Monterey systems to 12.1 or later.
- Upgrade Big Sur systems to 11.6.2 or later.
- Apply Security Update 2021-008 on Catalina systems.
- Avoid processing untrusted USD files until systems are patched.
- Check Apple security guidance for any later superseding updates.
Validation and detection
- Inventory managed Apple devices and record OS versions.
- Confirm devices meet or exceed the Apple fixed versions.
- Review MDM patch compliance for iOS, iPadOS, and macOS fleets.
- Identify workflows that ingest USD files and prioritize those endpoints.
- Confirm Catalina systems received Security Update 2021-008.
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
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CVE-2021-30940 mapping review
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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/HT212976CVE reference · x_refsource_MISC
- 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.