An out-of-bounds read was addressed with improved input validation.

published 2019-12-18 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-18031

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 17.1%; EPSS 17.1% chance of exploitation in 30 days, percentile 97%
public exploits: 2; Exploit-DB

Patch / fix

fixed in 3

Apple iOS iOS 12.4.2, iOS 13
Apple watchOS watchOS 5.3.2, watchOS 6
Apple macOS macOS Mojave 10.14.6 Supplemental Update 2

Timeline

2019-09-24 First public exploit (EDB-47415)
2019-12-18 Published

Exploit prediction

17.13% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-47608 iMessage - Decoding NSSharedKeyDictionary can read ObjC Object at Attacker Controlled Address dos, 2019-11-11
EDB-47415 iMessage - Decoding NSSharedKeyDictionary Can Read Object Out of Bounds dos, 2019-09-24

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

Apple iOS
Apple watchOS
Apple macOS

Classification

Weakness

CWE-125 Out-of-bounds Read

References

Sources

CVE List CVE-2019-8641
NVD CVE-2019-8641

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary