What is CVE-2020-9921?

CVE-2020-9921 is a high-severity vulnerability in Apple macOS, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.0/10. Published 2020-10-22.

How severe is CVE-2020-9921?

High severity. CVSS v3 base score is 7.0 out of 10.

Buffer overflow in Apple macOS

CVE-2020-9921

A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Catalina 10.15.6. A malicious application may be able to execute arbitrary code with system privileges.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

EPSS: 0.002 (13.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apple Macos — versions unspecified
Apple Mac_os_x

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-787 — Out-of-bounds Write

References

product-security@apple.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-9921?: CVE-2020-9921 is a high-severity vulnerability in Apple macOS, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.0/10. Published 2020-10-22.
How severe is CVE-2020-9921?: High severity. CVSS v3 base score is 7.0 out of 10.