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.
Official resources
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CVE-2023-42916 CVE record
CVE.org
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CVE-2023-42916 NVD detail
NVD
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CISA Known Exploited Vulnerabilities catalog
CISA - Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
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Source item URL
cisa_kev
Publicly disclosed in the supplied CVE and CISA KEV records on 2023-12-04. The supplied corpus indicates known exploitation status via CISA KEV.