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CVE-2021-30983

HighPublished

Apple iOS and iPadOS Buffer Overflow Vulnerability

Published: Aug 24, 2021
Updated: Oct 21, 2025
Assigning CNA: apple
Evidence observed: Jun 27, 2022

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS probability estimate

2.9%

Low · next 30 days

Percentile: 86.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 15.2 and iPadOS 15.2. An application may be able to execute arbitrary code with kernel privileges.

Sources

n-daysPoC
Curated collection of iOS kernel and userland exploit PoCs and writeups for in-the-wild and researched CVEs, including binary-diffed vulnerability analyses.

Responsible use

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