What is CVE-2020-3834?

CVE-2020-3834 is a high-severity vulnerability in Apple watchOS, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2020-02-27.

How severe is CVE-2020-3834?

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

Buffer overflow in Apple watchOS

CVE-2020-3834

A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 6.1.2. An application may be able to execute arbitrary code with kernel privileges.

Vulnerability class: Buffer Overflow

Published 2020-02-27 · 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: 0.013 (70.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Apple watchOS — versions unspecified

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

support.apple.com/HT210921 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-3834?: CVE-2020-3834 is a high-severity vulnerability in Apple watchOS, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2020-02-27.
How severe is CVE-2020-3834?: High severity. CVSS v3 base score is 7.8 out of 10.