CVE-2022-42856: in the CISA KEV catalogue
Apple iOS Type Confusion Vulnerability. CISA added CVE-2022-42856 to the Known Exploited Vulnerabilities catalogue on 2022-12-14 with a default due date of 2023-01-04. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Apple iOS contains a type confusion vulnerability when processing maliciously crafted web content leading to code execution. (CISA description)
- Vendor / product
- Apple iOS
- CWE
- CWE-843
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 8.5%, percentile 95 (scored 2026-11-03)
EPSS puts about 8.5 in 100 odds (8.5%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 95% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2022-42856 in the CISA KEV catalogue?
Yes. CISA added CVE-2022-42856 (Apple iOS Type Confusion Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-12-14. CISA's default due date for it is 2023-01-04.
Is CVE-2022-42856 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2022-42856. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2022-42856?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2022-42856