Known Exploited Vulnerability
8.8
HIGH CVSS 3.1
CVE-2021-30952
Apple Multiple Products Integer Overflow or Wraparound Vulnerability - [Actively Exploited]
Description

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.

INFO

Published Date :

Aug. 24, 2021, 7:15 p.m.

Last Modified :

March 6, 2026, 1:44 p.m.

Remotely Exploit :

Yes !
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.

Required Action :

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

Known Ransomware Campaign Use:

Unknown

Notes :

https://support.apple.com/en-us/HT212975 ; https://support.apple.com/en-us/HT212976 ; https://support.apple.com/en-us/HT212978 ; https://support.apple.com/en-us/HT212980 ; https://support.apple.com/en-us/HT212982 ; https://nvd.nist.gov/vuln/detail/CVE-2021-30952

Affected Products

The following products are affected by CVE-2021-30952 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Apple macos
2 Apple iphone_os
3 Apple tvos
4 Apple watchos
5 Apple safari
6 Apple ipados
1 Fedoraproject fedora
1 Debian debian_linux
1 Webkitgtk webkitgtk
1 Wpewebkit wpe_webkit
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.1 HIGH [email protected]
CVSS 3.1 HIGH 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
This addresses an arbitrary code execution vulnerability by updating web content processing components.
  • Upgrade affected Apple products to the latest version.
  • Update vulnerable webkit packages.
  • Update webkitgtk4 packages.
Public PoC/Exploit Available at Github

CVE-2021-30952 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-30952.

URL Resource
http://www.openwall.com/lists/oss-security/2022/01/21/2 Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ Broken Link
https://support.apple.com/en-us/HT212975 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212976 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212978 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212980 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212982 Release Notes Vendor Advisory
https://www.debian.org/security/2022/dsa-5060 Mailing List Third Party Advisory
https://www.debian.org/security/2022/dsa-5061 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/21/2 Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ Broken Link
https://support.apple.com/en-us/HT212975 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212976 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212978 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212980 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212982 Release Notes Vendor Advisory
https://www.debian.org/security/2022/dsa-5060 Mailing List Third Party Advisory
https://www.debian.org/security/2022/dsa-5061 Mailing List Third Party Advisory
https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit Exploit Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-30952 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-30952 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Reverse-engineering reconstruction of the Coruna iOS exploit kit (iOS 16/17 chains)

C Python

Updated: 10 hours, 52 minutes ago
31 stars 4 fork 4 watcher
Born at : March 14, 2026, 7:27 p.m. This repo has been linked 12 different CVEs too.

None

Python

Updated: 4 days, 11 hours ago
0 stars 0 fork 0 watcher
Born at : Jan. 26, 2026, 8:17 a.m. This repo has been linked 2857 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-30952 vulnerability anywhere in the article.

  • CybersecurityNews
CISA Warns of macOS and iOS Vulnerabilities Exploited in Attacks

CISA Warns macOS and iOS Vulnerabilities Exploit The Cybersecurity and Infrastructure Security Agency (CISA) has issued a critical alert regarding multiple Apple vulnerabilities currently facing activ ... Read more

Published Date: Mar 09, 2026 (1 week, 3 days ago)
  • Ars Technica
Feds take notice of iOS vulnerabilities exploited under mysterious circumstances

Coruna is also notable for its use by three distinct hacking groups. Google first detected its use in February of last year in an operation conducted by a “customer of a surveillance vendor.” The vuln ... Read more

Published Date: Mar 06, 2026 (1 week, 5 days ago)
  • TheCyberThrone
CISA Adds Five Flaws to Its KEV Catalog

March 6, 2026Federal agencies face a three-week deadline to remediate a set of vulnerabilities spanning consumer devices, industrial controllers, and surveillance cameras — all confirmed to be activel ... Read more

Published Date: Mar 06, 2026 (1 week, 5 days ago)
  • Daily CyberSecurity
Coruna: The High-Powered iOS Exploit Kit Proliferating Across the Global Threat Landscape

Coruna iOS exploit kit timeline The Google Threat Intelligence Group (GTIG) has detailed the curtain on “Coruna,” a formidable iOS exploit kit that has transitioned from the hands of commercial survei ... Read more

Published Date: Mar 05, 2026 (2 weeks ago)
  • The Hacker News
Coruna iOS Exploit Kit Uses 23 Exploits Across Five Chains Targeting iOS 13–17.2.1

Google said it identified a "new and powerful" exploit kit dubbed Coruna (aka CryptoWaters) targeting Apple iPhone models running iOS versions between 13.0 and 17.2.1. The exploit kit featured five fu ... Read more

Published Date: Mar 04, 2026 (2 weeks ago)
  • CybersecurityNews
Coruna Exploit Kit With 23 Exploits Hacked Thousands of iPhones

Coruna iOS Exploit Kit Google’s Threat Intelligence Group (GTIG) has uncovered Coruna, a sophisticated iOS exploit kit containing 23 exploits across five full exploit chains that compromised thousands ... Read more

Published Date: Mar 04, 2026 (2 weeks, 1 day ago)
  • Google Cloud
Coruna: The Mysterious Journey of a Powerful iOS Exploit Kit

Introduction Google Threat Intelligence Group (GTIG) has identified a new and powerful exploit kit targeting Apple iPhone models running iOS version 13.0 (released in September 2019) up to version 17. ... Read more

Published Date: Mar 03, 2026 (2 weeks, 1 day ago)

The following table lists the changes that have been made to the CVE-2021-30952 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Modified Analysis by [email protected]

    Mar. 06, 2026

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* OR *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
    Changed CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* OR *cpe:2.3:a:webkitgtk:webkitgtk:*:*:*:*:*:*:*:* versions up to (excluding) 2.34.4 *cpe:2.3:a:wpewebkit:wpe_webkit:*:*:*:*:*:*:*:* versions up to (excluding) 2.34.4
    Added Reference Type Apple Inc.: http://www.openwall.com/lists/oss-security/2022/01/21/2 Types: Mailing List, Third Party Advisory
    Added Reference Type Apple Inc.: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ Types: Broken Link
    Added Reference Type Apple Inc.: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ Types: Broken Link
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/HT212975 Types: Release Notes, Vendor Advisory
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/HT212976 Types: Release Notes, Vendor Advisory
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/HT212978 Types: Release Notes, Vendor Advisory
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/HT212980 Types: Release Notes, Vendor Advisory
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/HT212982 Types: Release Notes, Vendor Advisory
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952 Types: US Government Resource
    Added Reference Type CISA-ADP: https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit Types: Exploit, Third Party Advisory
    Added Reference Type CVE: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ Types: Broken Link
    Added Reference Type CVE: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ Types: Broken Link
    Added Reference Type CVE: https://support.apple.com/en-us/HT212976 Types: Release Notes, Vendor Advisory
    Added Reference Type CVE: https://support.apple.com/en-us/HT212975 Types: Release Notes, Vendor Advisory
    Added Reference Type CVE: https://www.debian.org/security/2022/dsa-5060 Types: Mailing List, Third Party Advisory
    Added Reference Type CVE: https://support.apple.com/en-us/HT212982 Types: Release Notes, Vendor Advisory
    Added Reference Type Apple Inc.: https://www.debian.org/security/2022/dsa-5060 Types: Mailing List, Third Party Advisory
    Added Reference Type Apple Inc.: https://www.debian.org/security/2022/dsa-5061 Types: Mailing List, Third Party Advisory
    Added Reference Type CVE: https://support.apple.com/en-us/HT212980 Types: Release Notes, Vendor Advisory
    Added Reference Type CVE: https://support.apple.com/en-us/HT212978 Types: Release Notes, Vendor Advisory
    Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2022/01/21/2 Types: Mailing List, Third Party Advisory
    Added Reference Type CVE: https://www.debian.org/security/2022/dsa-5061 Types: Mailing List, Third Party Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Mar. 05, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    Added CWE CWE-190
    Added Reference https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Mar. 05, 2026

    Action Type Old Value New Value
    Added Date Added 2026-03-05
    Added Due Date 2026-03-26
    Added Vulnerability Name Apple Multiple Products Integer Overflow or Wraparound Vulnerability
    Added Required Action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2022/01/21/2
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
    Added Reference https://support.apple.com/en-us/HT212975
    Added Reference https://support.apple.com/en-us/HT212976
    Added Reference https://support.apple.com/en-us/HT212978
    Added Reference https://support.apple.com/en-us/HT212980
    Added Reference https://support.apple.com/en-us/HT212982
    Added Reference https://www.debian.org/security/2022/dsa-5060
    Added Reference https://www.debian.org/security/2022/dsa-5061
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Source Update by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Changed Source MITRE Apple Inc.
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference Apple Inc. https://support.apple.com/en-us/HT212975 [No types assigned]
    Added Reference Apple Inc. https://support.apple.com/en-us/HT212976 [No types assigned]
    Added Reference Apple Inc. https://support.apple.com/en-us/HT212978 [No types assigned]
    Added Reference Apple Inc. https://support.apple.com/en-us/HT212980 [No types assigned]
    Added Reference Apple Inc. https://support.apple.com/en-us/HT212982 [No types assigned]
    Added Reference Apple Inc. http://www.openwall.com/lists/oss-security/2022/01/21/2 [No types assigned]
    Added Reference Apple Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ [No types assigned]
    Added Reference Apple Inc. https://www.debian.org/security/2022/dsa-5061 [No types assigned]
    Added Reference Apple Inc. https://www.debian.org/security/2022/dsa-5060 [No types assigned]
    Added Reference Apple Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ [No types assigned]
    Removed Reference MITRE https://support.apple.com/en-us/HT212975
    Removed Reference MITRE https://support.apple.com/en-us/HT212978
    Removed Reference MITRE https://support.apple.com/en-us/HT212976
    Removed Reference MITRE https://support.apple.com/en-us/HT212982
    Removed Reference MITRE https://support.apple.com/en-us/HT212980
    Removed Reference MITRE http://www.openwall.com/lists/oss-security/2022/01/21/2
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
    Removed Reference MITRE https://www.debian.org/security/2022/dsa-5061
    Removed Reference MITRE https://www.debian.org/security/2022/dsa-5060
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
  • Modified Analysis by [email protected]

    Feb. 25, 2022

    Action Type Old Value New Value
    Changed Reference Type http://www.openwall.com/lists/oss-security/2022/01/21/2 No Types Assigned http://www.openwall.com/lists/oss-security/2022/01/21/2 Issue Tracking, Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ Issue Tracking, Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ Mailing List, Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2022/dsa-5060 No Types Assigned https://www.debian.org/security/2022/dsa-5060 Issue Tracking, Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2022/dsa-5061 No Types Assigned https://www.debian.org/security/2022/dsa-5061 Issue Tracking, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Feb. 06, 2022

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jan. 26, 2022

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2022/dsa-5061 [No Types Assigned]
    Added Reference https://www.debian.org/security/2022/dsa-5060 [No Types Assigned]
  • CVE Modified by [email protected]

    Jan. 23, 2022

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jan. 21, 2022

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2022/01/21/2 [No Types Assigned]
  • Initial Analysis by [email protected]

    Dec. 29, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    Changed Reference Type https://support.apple.com/en-us/HT212975 No Types Assigned https://support.apple.com/en-us/HT212975 Vendor Advisory
    Changed Reference Type https://support.apple.com/en-us/HT212976 No Types Assigned https://support.apple.com/en-us/HT212976 Vendor Advisory
    Changed Reference Type https://support.apple.com/en-us/HT212978 No Types Assigned https://support.apple.com/en-us/HT212978 Vendor Advisory
    Changed Reference Type https://support.apple.com/en-us/HT212980 No Types Assigned https://support.apple.com/en-us/HT212980 Vendor Advisory
    Changed Reference Type https://support.apple.com/en-us/HT212982 No Types Assigned https://support.apple.com/en-us/HT212982 Vendor Advisory
    Added CWE NIST CWE-190
    Added CPE Configuration OR *cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* versions up to (excluding) 15.2 *cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* versions up to (excluding) 15.2 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 15.2 *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 12.0 up to (excluding) 12.1 *cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* versions up to (excluding) 15.2 *cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* versions up to (excluding) 8.3
  • CVE Modified by [email protected]

    Dec. 23, 2021

    Action Type Old Value New Value
    Changed Description ** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by the CVE program. Notes: none. 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.
    Added Reference https://support.apple.com/en-us/HT212975 [No Types Assigned]
    Added Reference https://support.apple.com/en-us/HT212978 [No Types Assigned]
    Added Reference https://support.apple.com/en-us/HT212976 [No Types Assigned]
    Added Reference https://support.apple.com/en-us/HT212982 [No Types Assigned]
    Added Reference https://support.apple.com/en-us/HT212980 [No Types Assigned]
  • CVE Unrejected by [email protected]

    Dec. 23, 2021

    Action Type Old Value New Value
  • CVE Rejected by [email protected]

    Aug. 24, 2021

    Action Type Old Value New Value
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.