What is CVE-2020-9847?

CVE-2020-9847 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 8.6/10. Published 2020-06-09.

How severe is CVE-2020-9847?

High severity. CVSS v3 base score is 8.6 out of 10.

Out-of-bounds Read in Apple macOS

CVE-2020-9847

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.5. A malicious application may be able to break out of its sandbox.

Vulnerability class: Buffer Overflow

Published 2020-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

support.apple.com/HT211170 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-9847?: CVE-2020-9847 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 8.6/10. Published 2020-06-09.
How severe is CVE-2020-9847?: High severity. CVSS v3 base score is 8.6 out of 10.