Apple Multiple Products Integer Overflow or Wraparound Vulnerability (CVE-2021-30952)
Severity: high · Patch status: unknown · Since 2026-03-05 · CVE-2021-30952
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. CISA added CVE-2021-30952 to its Known Exploited Vulnerabilities catalog on Mar 5, 2026, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Mar 26, 2026 (BOD 22-01); treat that as the outer limit.
Sources
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