What is CVE-2021-1854?

CVE-2021-1854 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2021-09-08.

How severe is CVE-2021-1854?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Apple iOS And Ipados

CVE-2021-1854

A call termination issue with was addressed with improved logic. This issue is fixed in iOS 14.5 and iPadOS 14.5. A legacy cellular network can automatically answer an incoming call when an ongoing call ends or drops. .

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

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

Frequently asked questions

What is CVE-2021-1854?: CVE-2021-1854 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2021-09-08.
How severe is CVE-2021-1854?: Medium severity. CVSS v3 base score is 4.3 out of 10.