What is CVE-2019-8511?

CVE-2019-8511 is a high-severity vulnerability in Apple iOS, 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-2019-8511?

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

Buffer overflow in Apple iOS

CVE-2019-8511

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.2, macOS Mojave 10.14.4, watchOS 5.2. A malicious application may be able to elevate 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:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Apple iOS — versions unspecified
Apple Iphone OS
Apple macOS — versions unspecified
Apple Mac OS X
Apple watchOS — versions unspecified

Weakness classification (CWE)

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

References

support.apple.com/HT209599 (Vendor Advisory)
support.apple.com/HT209600 (Vendor Advisory)
support.apple.com/HT209602 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-8511?: CVE-2019-8511 is a high-severity vulnerability in Apple iOS, 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-2019-8511?: High severity. CVSS v3 base score is 7.8 out of 10.