Is CVE-2021-30805 actively exploited?

No active exploitation of CVE-2021-30805 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-30805 be exploited remotely?

Yes. CVE-2021-30805 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-30805?

CVE-2021-30805 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-30805

CRITICAL

CVE-2021-30805

CWE-787Published: September 8, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. An application may be able to execute arbitrary code with kernel privileges.

NVD Source

Technical Analysis

CVE-2021-30805 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.