CVE-2019-8663

MEDIUM

iPhone OS < 12.4 and macOS < 10.14.6 - Memory Leak

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2019-8663. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit demonstrates an information leak vulnerability in the SGBigUTF8String class due to improper handling of non-null-terminated UTF-8 data during decoding. The PoC compiles a program that triggers the leak, displaying leaked memory contents.

Description

This issue was addressed with improved checks. This issue is fixed in iOS 12.4, macOS Mojave 10.14.6. A remote attacker may be able to leak memory.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · textdosmultiple
https://www.exploit-db.com/exploits/47257

This exploit demonstrates an information leak vulnerability in the SGBigUTF8String class due to improper handling of non-null-terminated UTF-8 data during decoding. The PoC compiles a program that triggers the leak, displaying leaked memory contents.

Classification
Working Poc 90%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Apple CoreSuggestionsInternals (iMessage component)
No auth needed
Prerequisites: Access to a macOS system with CoreSuggestionsInternals framework · Compiler (clang) and necessary headers
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Vendor Advisory x_refsource_misc
https://support.apple.com/HT210346
Vendor Advisory x_refsource_misc
https://support.apple.com/HT210348

Scores

CVSS v3 5.3
EPSS 0.0627
EPSS Percentile 92.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Details

Status published
Products (2)
apple/iphone_os < 12.4
apple/mac_os_x < 10.14.6
Published Dec 18, 2019
Tracked Since Feb 18, 2026