What is CVE-2020-9869?

CVE-2020-9869 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2020-10-22.

How severe is CVE-2020-9869?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Apple macOS

CVE-2020-9869

A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Catalina 10.15.6. A remote attacker may cause an unexpected application termination.

Vulnerability class: Buffer Overflow

Published 2020-10-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

support.apple.com/kb/HT211289 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-9869?: CVE-2020-9869 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2020-10-22.
How severe is CVE-2020-9869?: High severity. CVSS v3 base score is 7.5 out of 10.