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CVE-2021-30952

Apple Multiple Products Integer Overflow or Wraparound Vulnerability

Apple Multiple Products
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationExploited in the wildAdded to KEV 5 Mar 2026CISA KEV
Exploit odds (EPSS)6.96%Chance of exploitation activity in the next 30 days, higher than 94% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in8.3Also 15.2, 12.1CVE List
Federal deadline26 Mar 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 24 Aug 2021, 18:50 UTCPublishedCVE List
  2. 5 Mar 2026Added to CISA KEVCISA KEV

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.

Text from CVE List

Affected versions 4

  • watchOSaffected: unspecified before 8.3CVE List
  • iOS and iPadOSaffected: unspecified before 15.2CVE List
  • macOSaffected: unspecified before 12.1CVE List
  • macOSaffected: unspecified before 15.2CVE List

References 12