What is CVE-2019-8508?

CVE-2019-8508 is a high-severity vulnerability in Apple macOS, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2019-12-18.

How severe is CVE-2019-8508?

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

Buffer overflow in Apple macOS

CVE-2019-8508

A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Mojave 10.14.4. Mounting a maliciously crafted NFS network share may lead to arbitrary code execution with system privileges.

Vulnerability class: Buffer Overflow

Published 2019-12-18 · 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 (34.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% 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

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

support.apple.com/HT209600 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-8508?: CVE-2019-8508 is a high-severity vulnerability in Apple macOS, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2019-12-18.
How severe is CVE-2019-8508?: High severity. CVSS v3 base score is 7.8 out of 10.