What is CVE-2019-8506?

CVE-2019-8506 is a high-severity vulnerability in Apple Icloud, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 8.8/10. Published 2019-12-18.

How severe is CVE-2019-8506?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2019-8506 known to be exploited?

Yes. CVE-2019-8506 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-04), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.

Vulnerability in Apple Icloud

CVE-2019-8506

A type confusion issue was addressed with improved memory handling. This issue is fixed in iOS 12.2, tvOS 12.2, watchOS 5.2, Safari 12.1, iTunes 12.9.4 for Windows, iCloud for Windows 7.11. Processing maliciously crafted web content may lead to arbitrary code execution.

Published 2019-12-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.162 (96.9th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.181 · newest: 0.162 · change: -0.019

Affected products

Apple Icloud
Apple Icloud For Windows — versions unspecified
Apple iOS — versions unspecified
Apple Iphone OS
Apple Itunes
Apple Itunes For Windows — versions unspecified
Apple Safari — versions unspecified
Apple tvOS — versions unspecified
Apple watchOS — versions unspecified
Red Hat Enterprise Linux Desktop — versions 7.0

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-05-04. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-25.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

support.apple.com/HT209599 (Release Notes, Vendor Advisory)
support.apple.com/HT209601 (Release Notes, Vendor Advisory)
support.apple.com/HT209603 (Release Notes, Vendor Advisory)
support.apple.com/HT209604 (Release Notes, Vendor Advisory)
support.apple.com/HT209605 (Release Notes, Vendor Advisory)
support.apple.com/HT209602 (Release Notes, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2019-8506?: CVE-2019-8506 is a high-severity vulnerability in Apple Icloud, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 8.8/10. Published 2019-12-18.
How severe is CVE-2019-8506?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2019-8506 known to be exploited?: Yes. CVE-2019-8506 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-04), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.