Exploited vulnerability · CISA KEV

Is CVE-2023-42916 exploited? Yes: in CISA KEV since 4 Dec 2023

Gociux · Apple Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-42916, Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 4 Dec 2023, 4 days after it was published. It affects Apple Multiple Products. If you run it, CISA's required action is: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

exploitedYesCISA KEV · 4 Dec 2023

ransomwareNot knownno confirmed use

EPSStop 5%very likely to be exploited

severity6.5CVSS 3.1 · medium

US federal due25 Dec 2023BOD 22-01 deadline

What it is

Apple iOS, iPadOS, macOS, and Safari WebKit contain an out-of-bounds read vulnerability that may disclose sensitive information when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Vendor	Apple (96 exploited CVEs in KEV)
Product	Multiple Products
Vulnerability	Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability
Weakness	CWE-125
Published	30 Nov 2023
Added to KEV	4 Dec 2023
Reported by (CNA)	apple

What to do

Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apple CVE at once.
Apply the fix. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 30 Nov 2023.
Get told next time. Email alerts when CISA adds a CVE for Apple.

Other exploited CVEs in Multiple Products

CVE-2024-27834: Apple Multiple Products Improper Authentication Vulnerability (4 Nov 2026)
CVE-2026-86950: Apple Multiple Products Out-of-Bounds Write Vulnerability (29 Sep 2026)
CVE-2025-43510: Apple Multiple Products Improper Locking Vulnerability (20 Mar 2026)
CVE-2025-43520: Apple Multiple Products Classic Buffer Overflow Vulnerability (20 Mar 2026)
CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability (20 Mar 2026)
CVE-2023-43000: Apple Multiple products Use-After-Free Vulnerability (5 Mar 2026)

References

Questions

Is CVE-2023-42916 being exploited?

Yes. CISA added CVE-2023-42916 to the Known Exploited Vulnerabilities catalog on 4 Dec 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-42916 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2023-42916?

Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Check Apple's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Multiple Products and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in December 2023 · Apple scorecard · act-now radar.

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