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PatchSiren cyber security CVE debrief

CVE-2021-30858 Apple CVE debrief

CVE-2021-30858 is a use-after-free vulnerability affecting Apple iOS, iPadOS, and macOS. CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03, indicating it has been observed in active exploitation. Apple users and administrators should treat this as a high-priority remediation item and apply vendor updates as soon as possible.

Vendor
Apple
Product
iOS, iPadOS, and macOS
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Apple device users, enterprise macOS/iOS/iPadOS administrators, endpoint/security teams, and organizations that rely on Apple-managed fleets or mobile device management.

Technical summary

The supplied sources identify the issue as a use-after-free vulnerability in Apple iOS, iPadOS, and macOS. No additional technical details, affected component names, or exploitation conditions are provided in the source corpus. The most important operational signal is its inclusion in CISA's KEV catalog and the associated instruction to apply updates per vendor guidance.

Defensive priority

Very high. KEV inclusion means defenders should prioritize remediation over routine patch queues, especially on broadly deployed Apple endpoints.

Recommended defensive actions

  • Apply Apple vendor updates that address CVE-2021-30858 as soon as possible.
  • Check Apple device management and inventory data to identify exposed iPhone, iPad, and Mac systems.
  • Verify patch compliance across managed fleets and escalate any exceptions.
  • Monitor CISA KEV and Apple advisories for any follow-on guidance or related updates.
  • Treat unpatched systems as elevated risk until remediation is confirmed.

Evidence notes

The debrief is based on the supplied CVE metadata and CISA KEV source item only. The corpus confirms the vulnerability class (use-after-free), the affected vendor/product families (Apple iOS, iPadOS, and macOS), the CVE publication date (2021-11-03), and KEV status with a due date of 2021-11-17. No CVSS score, exploit chain details, or component-level technical root cause were provided.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-30858 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-30858

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2021-30858 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-30858

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

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.