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Fencer Vulns
critical 9.8

CVE-2019-8662 json

This issue was addressed with improved checks.

published 2019-12-18 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-18052

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.8%
EPSS 9.8% chance of exploitation in 30 days, percentile 95%
public exploits
2
Exploit-DB

Summary

This issue was addressed with improved checks. This issue is fixed in iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, watchOS 5.3. An attacker may be able to trigger a use-after-free in an application deserializing an untrusted NSDictionary.

Patch / fix

  • Apple iOS iOS 12.4
  • Apple macOS macOS Mojave 10.14.6
  • Apple tvOS tvOS 12.4
  • Apple watchOS watchOS 5.3

Timeline

  1. First public exploit (EDB-47189)
  2. Published

Exploit prediction

9.78% chance of exploitation in the next 30 days, higher than 95% 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-47189 macOS / iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary Instances dos, 2019-07-30

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 macOS
  • Apple tvOS
  • Apple watchOS

Classification

Weakness

References

Sources

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.