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PatchSiren cyber security CVE debrief

CVE-2023-42916 Apple CVE debrief

CVE-2023-42916 is an Apple WebKit out-of-bounds read vulnerability affecting multiple Apple products. CISA added it to the Known Exploited Vulnerabilities catalog on 2023-12-04, which makes it a high-priority issue for defenders. The supplied corpus does not include a CVSS score, so prioritization here is driven by known exploitation status and vendor remediation guidance referenced by CISA.

Vendor
Apple
Product
Multiple Products
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-12-04
Original CVE updated
2023-12-04
Advisory published
2023-12-04
Advisory updated
2023-12-04

Who should care

Apple device administrators, endpoint security teams, mobile device management teams, and organizations that rely on Apple products with WebKit-based browsing or embedded web content should treat this as urgent. Asset owners should identify exposed Apple endpoints and confirm vendor remediation has been applied.

Technical summary

The vulnerability is described in the supplied sources as an out-of-bounds read in WebKit. That indicates a memory-safety flaw in the browser engine used across Apple products. The corpus does not provide additional technical detail, exploit mechanics, or affected version ranges, so the safest interpretation is to follow Apple’s remediation guidance referenced by CISA and verify affected products are updated.

Defensive priority

High. CISA listing in the KEV catalog indicates known exploitation, and the due date in the supplied timeline was 2023-12-25. Defenders should treat remediation as time-sensitive and inventory-driven.

Recommended defensive actions

  • Identify Apple products in your environment that use WebKit or receive Apple security updates.
  • Apply Apple vendor remediations referenced by CISA as soon as possible.
  • Validate patch status across managed and unmanaged Apple endpoints.
  • If remediation cannot be applied immediately, follow vendor/CISA mitigation guidance or reduce exposure to the affected product.
  • Monitor for CISA KEV updates and Apple security advisories related to this issue.

Evidence notes

The source corpus identifies the issue as 'Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability' and marks it as a CISA Known Exploited Vulnerability. The supplied metadata lists dateAdded as 2023-12-04 and dueDate as 2023-12-25. No CVSS score is included in the supplied data. CISA notes reference Apple support articles HT214031, HT214032, and HT214033, plus the NVD entry, but the corpus does not provide their contents.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-42916 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-42916

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

  • CVE-2023-42916 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-42916

    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.