What is CVE-2023-40418?

CVE-2023-40418 is a medium-severity vulnerability in Apple watchOS. CVSS score: 5.5/10. Published 2023-09-27.

How severe is CVE-2023-40418?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Apple watchOS

CVE-2023-40418

An authentication issue was addressed with improved state management. This issue is fixed in watchOS 10. An Apple Watch Ultra may not lock when using the Depth app.

Published 2023-09-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.0th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

References

support.apple.com/en-us/HT213937 (Release Notes, Vendor Advisory)
seclists.org/fulldisclosure/2023/Oct/9 (Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2023-40418?: CVE-2023-40418 is a medium-severity vulnerability in Apple watchOS. CVSS score: 5.5/10. Published 2023-09-27.
How severe is CVE-2023-40418?: Medium severity. CVSS v3 base score is 5.5 out of 10.