What is CVE-2020-27951?

CVE-2020-27951 is a high-severity vulnerability in Apple iOS. CVSS score: 7.8/10. Published 2021-04-02.

How severe is CVE-2020-27951?

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

Vulnerability in Apple iOS

CVE-2020-27951

This issue was addressed with improved checks. This issue is fixed in watchOS 6.3, iOS 12.5, iOS 14.3 and iPadOS 14.3, watchOS 7.2. Unauthorized code execution may lead to an authentication policy violation.

Published 2021-04-02 · 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: 0.011 (63.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

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

References

support.apple.com/en-us/HT212003 (Vendor Advisory)
support.apple.com/en-us/HT212009 (Vendor Advisory)
support.apple.com/en-us/HT212004 (Vendor Advisory)
support.apple.com/en-us/HT212006 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-27951?: CVE-2020-27951 is a high-severity vulnerability in Apple iOS. CVSS score: 7.8/10. Published 2021-04-02.
How severe is CVE-2020-27951?: High severity. CVSS v3 base score is 7.8 out of 10.