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PatchSiren cyber security CVE debrief

CVE-2023-42917 Apple CVE debrief

CVE-2023-42917 is a CISA Known Exploited Vulnerability affecting Apple Multiple Products and described as a WebKit memory corruption vulnerability. Because it appears in CISA's KEV catalog, defenders should treat it as urgent and follow Apple’s remediation guidance referenced by CISA. The public corpus supplied here does not include affected versions or a CVSS score, so the safest response is to prioritize vendor updates and validate exposure across Apple-managed fleets.

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, IT operations, and any organization that uses Apple products with WebKit-based browsing or embedded web content should treat this as high priority. The KEV listing indicates known exploitation, so internet-facing and broadly deployed Apple endpoints deserve immediate attention.

Technical summary

The available record identifies a WebKit memory corruption vulnerability in Apple Multiple Products. Memory corruption in a browser engine or rendering component can be security-sensitive because it may be reachable through web content. The supplied sources do not provide exploit details, affected product versions, or post-exploitation impact. The key defensive signal is that CISA added the issue to the Known Exploited Vulnerabilities catalog on 2023-12-04 with a remediation due date of 2023-12-25.

Defensive priority

High. A KEV listing means the vulnerability is known to be exploited in the wild. Apple environments should be triaged promptly, with remediation prioritized ahead of routine patch cycles.

Recommended defensive actions

  • Review Apple's remediation guidance linked from CISA for CVE-2023-42917 and apply the relevant updates as soon as possible.
  • Inventory Apple devices and services that rely on WebKit-based components to understand exposure.
  • Prioritize internet-facing, high-value, and broadly deployed Apple endpoints for validation and patching.
  • Confirm the vulnerability is remediated before the CISA due date of 2023-12-25 if the affected product is in use.
  • If remediation cannot be applied immediately, follow vendor-recommended mitigations or limit use of the affected product until updates are available.

Evidence notes

Source evidence is limited to the CISA KEV record and its linked official references. CISA identifies the issue as 'Apple Multiple Products WebKit Memory Corruption Vulnerability,' marks it as known exploited, and sets dateAdded to 2023-12-04 with dueDate 2023-12-25. The record also points to Apple support advisories HT214031, HT214032, and HT214033, plus the NVD and CVE.org entries. No CVSS score, affected version range, or exploit mechanics were included in the supplied corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-42917 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-42917

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

  • CVE-2023-42917 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-42917

    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.