CVE-2019-8839: 
macOS vulnerability analysis and mitigation

CVE-2019-8839 is a security vulnerability affecting Apple's CUPS (Common Unix Printing System) component in macOS Catalina 10.15, macOS Mojave 10.14.6, and macOS High Sierra 10.13.6. The vulnerability was discovered by Stephan Zeisberg of Security Research Labs and was disclosed in December 2019 as part of Apple's security updates (Apple Security).

The vulnerability is a buffer overflow issue in the CUPS printing system. The issue was addressed with improved bounds checking in the system implementation (Apple Security).

When exploited, an attacker in a privileged position may be able to perform a denial of service attack against the affected system (Apple Security).

The vulnerability requires the attacker to be in a privileged position to exploit the buffer overflow condition. No public exploits were reported at the time of disclosure (Apple Security).

Apple addressed this vulnerability in macOS Catalina 10.15.2, Security Update 2019-002 Mojave, and Security Update 2019-007 High Sierra, released on December 10, 2019. Users are advised to update their systems to these versions to receive the security fix (Apple Security).