Security readout for executives and security teams
Plain-English summary
CVE-2021-30961 is an Apple macOS vulnerability where opening or processing a maliciously crafted audio file could expose user information. Apple says the issue was a buffer overflow and that it was fixed with improved memory handling.
Executive priority
Treat this as a patch compliance issue for legacy macOS fleets. It is not documented as actively exploited in the provided sources, but the impact involves potential user information disclosure from crafted media content.
Technical view
The CVE describes a buffer overflow in macOS triggered by parsing a crafted audio file, with impact limited in the sources to user information disclosure. Apple fixed it in Security Update 2021-008 Catalina and macOS Big Sur 11.6.2. No CVSS, CWE, component name, or exact affected version range is provided.
Likely exposure
Exposure is most likely on macOS systems that did not receive Security Update 2021-008 Catalina or macOS Big Sur 11.6.2. The exact affected version range is not provided in the source bundle.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The stated attack condition is parsing a maliciously crafted audio file, but delivery method and practical exploitability details are not provided.
Researcher notes
Evidence is limited. Apple and CVE sources identify a buffer overflow, crafted audio parsing trigger, information disclosure impact, and fixed releases. They do not name the vulnerable component, provide CVSS/CWE data, or describe exploit mechanics.
Mitigation direction
- Update Catalina systems with Security Update 2021-008 if still in use.
- Update Big Sur systems to macOS 11.6.2 or later applicable vendor guidance.
- Check Apple advisories HT212979 and HT212981 for environment-specific update guidance.
- Limit handling of untrusted audio files on unpatched macOS systems.
Validation and detection
- Inventory macOS endpoints and identify Catalina or Big Sur systems below fixed levels.
- Confirm update installation through endpoint management or software update records.
- Verify security baselines flag unsupported or unpatched macOS versions.
- Review user reports involving suspicious audio files if relevant to incident triage.
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-2021-30961 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/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.