CVE-2021-1840 Memory corruption in macOS

What is CVE-2021-1840?

CVE-2021-1840 is a high-severity memory corruption vulnerability in Apple Mac Os X, published on 8 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A memory corruption issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave. A local attacker may be able to elevate their privileges.

Weakness: CWE-787

Which versions are affected by CVE-2021-1840?

It affects 2 products.

Products include Apple Mac Os X, Apple Macos.

How do I fix CVE-2021-1840?

No fix has been published for CVE-2021-1840 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-2021-1840 being exploited?

There is no known exploitation of CVE-2021-1840 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-vgh4-jr3v-jg28.