CVE-2021-30952

criticalknown exploitedcovered by 1 sourcefirst seen 2026-03-05

Actively exploited. CVE-2021-30952 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-05) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

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.

CSIRTS triage

vendor: Apple Remote code execution

What: The vulnerability may lead to arbitrary code execution due to integer overflow or wraparound in processing web content.
Who is affected: Users of Apple tvOS, macOS, Safari, iPadOS, and watchOS are affected.
Urgency: Immediate action is required due to active exploitation and critical severity.
Action: Update all affected Apple products to the latest versions.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 94% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerabilitycisa-kev · 2026-03-05

External references

NVD record for CVE-2021-30952

CVE.org record

CISA KEV catalog

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