CVE-2021-30952 Apple CVE debrief

Who should care

Teams managing Apple endpoints and related Apple product estates, plus vulnerability management, endpoint security, and incident response teams.

Technical summary

The issue is described as an integer overflow or wraparound affecting Apple multiple products. CISA’s KEV entry indicates known exploitation and points defenders to Apple mitigation guidance. The supplied corpus does not identify specific affected versions, exploit conditions, or severity scoring.

Defensive priority

Urgent

Recommended defensive actions

• Inventory Apple products in your environment and compare them against Apple’s vendor advisories referenced by CISA KEV.
• Apply Apple mitigations or updates as soon as possible, using the vendor guidance cited in the KEV metadata (HT212975, HT212976, HT212978, HT212980, HT212982).
• Prioritize remediation before the KEV due date of 2026-03-26 and track completion in your vulnerability management process.
• If mitigations are unavailable, use compensating controls and follow applicable CISA BOD 22-01 guidance for cloud services.
• Validate that exposed systems are no longer vulnerable and monitor for suspicious activity consistent with active exploitation.

Evidence notes

The supplied corpus includes the CISA KEV JSON entry, which marks CVE-2021-30952 as known exploited and identifies Apple as the vendor. It also references Apple support articles (HT212975, HT212976, HT212978, HT212980, HT212982) for mitigation guidance and the official CVE/NVD records for identifier corroboration. No affected-version list, CVSS score, or exploit details were provided in the supplied materials.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.