How severe is CVE-2019-8506?

CVE-2019-8506 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2019-8506?

Affected package information for CVE-2019-8506 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2019-8506?

No fixed version has been published for CVE-2019-8506 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2019-8506 actively exploited in the wild?

Yes. There are 4 known exploit references for CVE-2019-8506, including 1 documented proof-of-concept exploit on Exploit-DB and 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2019-8506?

CVE-2019-8506 has an EPSS (Exploit Prediction Scoring System) score of 8.0%, placing it in the 92th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2019-8506 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2019-8506 (Apple Multiple Products Type Confusion Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-05-04. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-25. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

When was CVE-2019-8506 published, and has it been updated?

CVE-2019-8506 was published on December 18, 2019 and was last updated on March 15, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-05-04 — agencies required to remediate by 2022-05-25

CVE-2019-8506

HIGH

Published

Dec 18, 2019

Updated

Mar 15, 2026

Affected

0 pkgs

Patched

None yet

Exploits

4 known

EPSS Exploitation Probability

via FIRST.org ↗

8.0%probability of exploitation in next 30 days

Lower Risk92th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-46647dosmultiple✓ Verified

WebKit JavaScriptCore - 'createRegExpMatchesArray' Type Confusion

by Google Security Research · Apr 3, 2019

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2019-8506 in your stack?

O3 detects CVE-2019-8506 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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