Security readout for executives and security teams
Plain-English summary
Apple fixed CVE-2021-30991 in iOS 15.2 and iPadOS 15.2. The issue could let a malicious app run code with kernel privileges, which is a serious device-compromise impact. The provided sources do not show active exploitation.
Executive priority
Treat as high priority where older iPhones or iPads remain in service. Kernel-level impact can undermine device integrity, but urgency is moderated by no source-bundle evidence of active exploitation.
Technical view
Apple describes this as an out-of-bounds read addressed with improved bounds checking. The affected product is iOS and iPadOS, with versions unspecified in the CVE data, and the fix is iOS 15.2 and iPadOS 15.2.
Likely exposure
Likely exposure is iPhone and iPad devices running iOS or iPadOS versions earlier than 15.2. The source bundle does not provide exact affected version ranges or device models.
Exploitation context
The stated attack condition is a malicious application. The impact is arbitrary code execution with kernel privileges. The bundle marks KEV false and provides no cited evidence of active exploitation.
Researcher notes
The public data is sparse: no CVSS, CWE, exact vulnerable versions, or exploit details are provided. Analysis should stay anchored to Apple’s advisory and the CVE record, with validation focused on OS version compliance.
Mitigation direction
- Update eligible devices to iOS 15.2, iPadOS 15.2, or later.
- Use MDM inventory to identify devices below the fixed versions.
- Prioritize managed, high-value, and app-exposed mobile fleets.
- Review Apple’s advisory for any later vendor guidance.
Validation and detection
- Confirm each device reports iOS or iPadOS 15.2 or later.
- Check MDM compliance reports for outdated or unmanaged devices.
- Verify app installation controls on devices not yet updated.
- Document unsupported devices requiring replacement or risk acceptance.
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-2021-30991 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/HT212976CVE 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.