What is CVE-2021-1780?

CVE-2021-1780 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Initialization. CVSS score: 4.4/10. Published 2021-04-02.

How severe is CVE-2021-1780?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2021-1780

A memory initialization issue was addressed with improved memory handling. This issue is fixed in iOS 14.4 and iPadOS 14.4. An attacker in a privileged position may be able to perform a denial of service attack.

Vulnerability class: Dirty Pipe (CVE-2022-0847)

Published 2021-04-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (14.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.6% 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-665 — Improper Initialization

References

support.apple.com/en-us/HT212146 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1780?: CVE-2021-1780 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Initialization. CVSS score: 4.4/10. Published 2021-04-02.
How severe is CVE-2021-1780?: Medium severity. CVSS v3 base score is 4.4 out of 10.