Security readout for executives and security teams
Plain-English summary
CVE-2021-30983 is an Apple iOS and iPadOS kernel vulnerability. A malicious application may execute code with kernel privileges, meaning compromise could bypass normal app boundaries. Apple fixed it in iOS 15.2 and iPadOS 15.2. CISA lists it in KEV, so treat unpatched mobile devices as urgent.
Executive priority
High priority for organizations with Apple mobile fleets. The vulnerability has kernel-level impact and appears in CISA KEV. Remediation should focus on finding devices below iOS or iPadOS 15.2 and enforcing update compliance.
Technical view
The issue is described as a CWE-120 buffer overflow addressed by improved memory handling. The CVSS 3.1 score is 7.8 with local attack vector, low complexity, no privileges required, user interaction required, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is Apple iOS and iPadOS devices that have not received the 15.2 security update or later. The supplied sources do not state a precise vulnerable version range beyond the fixed releases.
Exploitation context
Active exploitation is supported by CISA KEV listing. The public bundle does not provide exploit mechanics, campaign details, affected targets, or indicators. The risk is elevated because successful exploitation may grant kernel privileges.
Researcher notes
Sources identify the flaw class and impact but not the vulnerable component, exploit path, or affected version floor. Analysis should stay focused on Apple’s fixed versions, CISA KEV status, and enterprise device-management evidence rather than assumed exploit details.
Mitigation direction
- Update iOS devices to iOS 15.2 or later.
- Update iPadOS devices to iPadOS 15.2 or later.
- Prioritize remediation because CISA lists this CVE in KEV.
- Check Apple guidance for any environment-specific instructions.
- Use MDM policy to block or isolate noncompliant devices.
Validation and detection
- Inventory managed iPhone and iPad OS versions.
- Confirm devices report iOS 15.2, iPadOS 15.2, or later.
- Review MDM compliance results for stale or offline devices.
- Verify vulnerability scanners map findings to CVE-2021-30983 accurately.
- Track remediation status separately for unmanaged executive or BYOD devices.
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.
CWE-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution 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-2021-30983 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/HT212976CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30983CVE reference · government-resource
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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.