CVE-2021-30983Apple iOS and iPadOS Buffer Overflow Vulnerability

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.

7.8 HIGHEPSS 2.92%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:51 UTC

OverviewCVSS details

7.8HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Aug 24, 2021
Assigner: apple

Affected

iOS and iPadOS (Apple)

Versions: before 15.2
Fixed in: 15.2

Exploitation

Public exploit: None listed
CISA KEV: Listed · Jun 27, 2022
KEV due date: Jul 18, 2022
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 8

2.92%chance of exploitation in 30 days

Higher than 87.13% of CVEs

CVSS 3.1 · NVD

7.8High

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

Attack vector: Local
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

9.3High

AV:N/AC:M/Au:N/C:C/I:C/A:C

Attack vector: Network
Attack complexity: Medium
Authentication: None
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
7.8	HIGH	3.1NVD	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.3	HIGH	2.0NVD	AV:N/AC:M/Au:N/C:C/I:C/A:C

CISA required action

⚡ Known exploited · remediation due Jul 18, 2022

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Details

CVE ID: CVE-2021-30983
Status: Analyzed
Assigner (CNA): apple
Published: Aug 24, 2021
Last modified: 2026-06-17 03:51 UTC
Weaknesses: CWE-120
CWE-119

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 14:45 UTC.