PatchSiren

PatchSiren cyber security CVE debrief

CVE-2021-30900 Apple CVE debrief

CVE-2021-30900 is an Apple out-of-bounds write vulnerability affecting iOS, iPadOS, and macOS. CISA placed it in the Known Exploited Vulnerabilities catalog on 2023-03-30, indicating it has been observed as exploited in the wild and should be treated as a priority patching item. CISA’s due date for remediation was 2023-04-20.

Vendor
Apple
Product
iOS, iPadOS, and macOS
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-03-30
Original CVE updated
2023-03-30
Advisory published
2023-03-30
Advisory updated
2023-03-30

Who should care

Apple platform administrators, mobile device management teams, endpoint security teams, and any organization that manages iPhones, iPads, or Macs should prioritize this CVE. Security teams responsible for KEV-driven remediation and compliance reporting should also track it closely.

Technical summary

The only technical detail available in the supplied corpus is that this Apple vulnerability is an out-of-bounds write affecting iOS, iPadOS, and macOS. The source corpus does not include the affected component, attack vector, or a vendor advisory write-up. Because CISA added the CVE to the KEV catalog, the practical takeaway is that the issue was known to be exploited and required prompt vendor-directed updating.

Defensive priority

High. KEV inclusion means this issue should be prioritized ahead of non-exploited vulnerabilities, especially on internet-facing, user-facing, or broadly deployed Apple devices.

Recommended defensive actions

  • Apply Apple updates per vendor instructions as soon as possible.
  • Use KEV-driven patch tracking to confirm all managed iOS, iPadOS, and macOS devices are remediated.
  • Validate remediation across mobile device management and endpoint inventory to catch off-network devices.
  • If full remediation is delayed, reduce exposure by limiting device access to sensitive services until updates are complete.
  • Monitor Apple and CISA sources for any advisory updates or follow-on guidance.

Evidence notes

Supported facts are limited to the supplied CVE metadata and CISA KEV entry. The corpus confirms the vulnerability type as an out-of-bounds write, the vendor as Apple, affected product families as iOS, iPadOS, and macOS, KEV publication on 2023-03-30, and remediation due date 2023-04-20. No CVSS score, exploit details, component name, or vendor advisory text was supplied.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-30900 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-30900

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

  • CVE-2021-30900 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-30900

    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.