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PatchSiren cyber security CVE debrief

CVE-2021-30807 Apple CVE debrief

CVE-2021-30807 is an Apple memory corruption vulnerability affecting multiple products and listed by CISA in the Known Exploited Vulnerabilities catalog. Because CISA added it to KEV on 2021-11-03 with a remediation due date of 2021-11-17, defenders should treat it as a high-priority patching item and follow Apple’s update guidance for affected systems.

Vendor
Apple
Product
Multiple Products
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

Organizations that manage Apple devices or software, especially endpoint, IT, and security teams responsible for patching and exposure reduction across mixed Apple fleets.

Technical summary

The available source material identifies this issue only as a memory corruption vulnerability in Apple Multiple Products. CISA’s KEV entry indicates it is known to be exploited and directs defenders to apply updates per vendor instructions. The provided corpus does not include affected-product specifics, exploit details, or version ranges, so remediation should be based on Apple’s official advisories and device inventory.

Defensive priority

High. CISA has designated this CVE as known exploited, which increases remediation urgency even though the source corpus does not provide additional technical detail.

Recommended defensive actions

  • Inventory Apple products and identify any systems that may be exposed to the affected software family.
  • Apply Apple security updates as soon as possible, following vendor instructions referenced by the KEV entry.
  • Verify remediation by confirming the updated software versions across managed devices.
  • Prioritize internet-facing, user-facing, and high-value endpoints first, then close any remaining patch gaps.
  • Monitor Apple device fleets for unusual behavior while remediation is in progress.

Evidence notes

This debrief is intentionally limited to the supplied corpus: the CVE record, CISA KEV metadata, and the official resource links provided. The source material supports only that the issue is an Apple memory corruption vulnerability affecting multiple products and that CISA added it to KEV on 2021-11-03 with a due date of 2021-11-17. No additional product, exploit, or impact specifics were asserted beyond that evidence.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-30807 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-30807

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

  • CVE-2021-30807 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-30807

    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.