What is CVE-2021-1814?

CVE-2021-1814 is a high-severity vulnerability in Apple macOS. CVSS score: 7.8/10. Published 2021-09-08.

How severe is CVE-2021-1814?

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

Vulnerability in Apple macOS

CVE-2021-1814

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.3, watchOS 7.4. Processing a maliciously crafted image may lead to arbitrary code execution.

Published 2021-09-08 · 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 (66.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.6% 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 watchOS — versions unspecified

References

support.apple.com/en-us/HT212324 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT212325 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1814?: CVE-2021-1814 is a high-severity vulnerability in Apple macOS. CVSS score: 7.8/10. Published 2021-09-08.
How severe is CVE-2021-1814?: High severity. CVSS v3 base score is 7.8 out of 10.