CVE-2021-30883: Apple Multiple Products Memory Corruption Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 23 May 2022, 272 days after the CVE record was published.

How likely is exploitation in the next 30 days?

14.7%

EPSS score, percentile 96.7 of all scored records

How severe?

7.8 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline 13 Jun 2022. Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

• before 15.0
• before 14.8
• before 12.0
• before 11.6
• before 8.1
• before 15.1

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 13 June 2022.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

• https://nvd.nist.gov/vuln/detail/CVE-2021-30883

Affected products and versions

As listed in the CVE record.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Apple iOS, macOS, watchOS, and tvOS contain a memory corruption vulnerability that could allow for remote code execution.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2021-30883 to its Known Exploited Vulnerabilities (KEV) catalog on 23 May 2022.
• CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
• The due date CISA sets for the required action is 13 Jun 2022.
• The CVE record was published on 24 Aug 2021, 272 days before it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 7.8 (High), taken from CISA's enrichment of the record.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 14.7% (percentile 96.7), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 15.0.2 and iPadOS 15.0.2, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1, macOS Big Sur 11.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited..

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-787: Out-of-bounds Write

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

References

• support.apple.com
• support.apple.com
• support.apple.com
• support.apple.com
• support.apple.com
• support.apple.com

More exploited Apple vulnerabilities

• CVE-2026-86950: Apple Multiple Products Out-of-Bounds Write Vulnerability (added 29 Sep 2026)
• CVE-2026-65400: Apple macOS Improper Authentication Vulnerability (added 18 Aug 2026)
• CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability (added 20 Mar 2026)
• CVE-2025-43510: Apple Multiple Products Improper Locking Vulnerability (added 20 Mar 2026)
• CVE-2025-43520: Apple Multiple Products Classic Buffer Overflow Vulnerability (added 20 Mar 2026)
• CVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerability (added 5 Mar 2026)