What is CVE-2021-1835?

CVE-2021-1835 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Missing Authorization. CVSS score: 4.6/10. Published 2021-09-08.

How severe is CVE-2021-1835?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Auth bypass in Apple iOS And Ipados

CVE-2021-1835

This issue was addressed with improved checks. This issue is fixed in iOS 14.5 and iPadOS 14.5. A person with physical access to an iOS device may be able to access notes from the lock screen.

Vulnerability class: Broken Access Control

Published 2021-09-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (22.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.4% 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: 0.003 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

support.apple.com/en-us/HT212317 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-1835?: CVE-2021-1835 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Missing Authorization. CVSS score: 4.6/10. Published 2021-09-08.
How severe is CVE-2021-1835?: Medium severity. CVSS v3 base score is 4.6 out of 10.