What is CVE-2021-1872?

CVE-2021-1872 is a medium-severity vulnerability in Apple iOS And Ipados. CVSS score: 4.3/10. Published 2021-09-08.

How severe is CVE-2021-1872?

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

Vulnerability in Apple iOS And Ipados

CVE-2021-1872

A logic issue was addressed with improved state management. This issue is fixed in iOS 14.5 and iPadOS 14.5, watchOS 7.4, macOS Big Sur 11.3. Muting a CallKit call while ringing may not result in mute being enabled.

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: 0.010 (62.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.7% 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 And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple macOS — versions unspecified
Apple watchOS — versions unspecified

References

support.apple.com/en-us/HT212317 (Vendor Advisory)
support.apple.com/en-us/HT212324 (Vendor Advisory)
support.apple.com/en-us/HT212325 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-1872?: CVE-2021-1872 is a medium-severity vulnerability in Apple iOS And Ipados. CVSS score: 4.3/10. Published 2021-09-08.
How severe is CVE-2021-1872?: Medium severity. CVSS v3 base score is 4.3 out of 10.