CVE-2021-30952Apple Multiple Products Integer Overflow or Wraparound Vulnerability

An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

8.8 HIGHEPSS 6.96%⚡ Known Exploited (CISA KEV)NVD: Analyzed

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

OverviewCVSS details

8.8HIGHCVSS 3.1

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

Affected

watchOS (Apple)

Versions: before 8.3
Fixed in: 8.3

+4 more products →

Exploitation

Public exploit: Yes · 1 reference
CISA KEV: Listed · Mar 5, 2026
KEV due date: Mar 26, 2026
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

6.96%chance of exploitation in 30 days

Higher than 94.16% of CVEs

CVSS 3.1 · CISA-ADP

8.8High

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

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

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

6.8Medium

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

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

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.8	HIGH	3.1CISA-ADP	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8	HIGH	3.1NVD	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8	MEDIUM	2.0NVD	AV:N/AC:M/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Mar 26, 2026

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Details

CVE ID: CVE-2021-30952
Status: Analyzed
Assigner (CNA): apple
Published: Aug 24, 2021
Last modified: 2026-06-17 03:51 UTC
Weaknesses: CWE-190

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 09:43 UTC.