What is CVE-2020-9841?

CVE-2020-9841 is a high-severity vulnerability in Apple macOS, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2020-06-09.

How severe is CVE-2020-9841?

High severity. CVSS v3 base score is 7.8 out of 10.

Integer overflow in Apple macOS

CVE-2020-9841

An integer overflow was addressed through improved input validation. This issue is fixed in macOS Catalina 10.15.5. An application may be able to execute arbitrary code with kernel privileges.

Vulnerability class: Integer Overflow

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

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.8th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

support.apple.com/HT211170 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-9841?: CVE-2020-9841 is a high-severity vulnerability in Apple macOS, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2020-06-09.
How severe is CVE-2020-9841?: High severity. CVSS v3 base score is 7.8 out of 10.