CVE-2020-9866 Memory corruption in macOS

What is CVE-2020-9866?

CVE-2020-9866 is a critical memory corruption vulnerability in Apple Mac Os X, published on 27 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. A buffer overflow may result in arbitrary code execution.

Weakness: CWE-120

Which versions are affected by CVE-2020-9866?

It affects 1 product.

Products include Apple Mac Os X.

How do I fix CVE-2020-9866?

No fix has been published for CVE-2020-9866 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-2020-9866 being exploited?

There is no known exploitation of CVE-2020-9866 in the wild and no public exploit code.

Other vulnerabilities in Apple Mac Os X

• CVE-2014-7169 GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Exploited Critical 9.8
• CVE-2014-6271 GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Exploited Critical 9.8
• CVE-2012-1823 PHP-CGI Query String Parameter Exploited Critical 9.8
• CVE-2021-30713 Apple macOS Unspecified Exploited High 7.8
• CVE-2019-8526 Apple macOS Use-After-Free Exploited High 7.8

All Apple Mac Os X vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-39x7-9p46-59cg.