What is CVE-2021-1751?

CVE-2021-1751 is a high-severity vulnerability in Apple macOS. CVSS score: 7.8/10. Published 2021-04-02.

How severe is CVE-2021-1751?

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

Vulnerability in Apple macOS

CVE-2021-1751

A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave. Mounting a maliciously crafted Samba network share may lead to arbitrary code execution.

Published 2021-04-02 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.004 (28.3th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X — versions 10.14.6, 10.15.7

References

support.apple.com/en-us/HT212147 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1751?: CVE-2021-1751 is a high-severity vulnerability in Apple macOS. CVSS score: 7.8/10. Published 2021-04-02.
How severe is CVE-2021-1751?: High severity. CVSS v3 base score is 7.8 out of 10.