CVE-2019-8839 Memory corruption in macOS

Medium 5.5 Published 27 Oct 2020 Updated 4 Aug 2024

A buffer overflow in macOS allows a privileged attacker to cause a denial of service, requiring a system update to fix.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2019-8839?

CVE-2019-8839 is a medium-severity memory corruption vulnerability in Apple Mac Os X, published on 27 Oct 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.2, Security Update 2019-002 Mojave, and Security Update 2019-007 High Sierra. An attacker in a privileged position may be able to perform a denial of service attack.

Weakness: CWE-120

Which versions are affected by CVE-2019-8839?

It affects 1 product.

Products include Apple Mac Os X.

How do I fix CVE-2019-8839?

No fix has been published for CVE-2019-8839 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-8839 being exploited?

There is no known exploitation of CVE-2019-8839 in the wild and no public exploit code.

All Apple Mac Os X vulnerabilities

Sources

Also known as GHSA-gx3r-m27w-v3g4.