CISA KEV

CVE-2021-30665

Apple Multiple Products WebKit Memory Corruption Vulnerability

Apple iOS, iPadOS, macOS, watchOS, and tvOS WebKit contain a memory corruption vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

VendorApple

ProductMultiple Products

EPSS3.7%

Added to KEVNov 03, 2021

Remediation DueNov 17, 2021

Known Ransomware UseUnknown

CWECWE-787

Required Action

Apply updates per vendor instructions.

From Disclosure to Action

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For CVE-2021-30665, added to the catalogue on Nov 03, 2021 with a remediation deadline of Nov 17, 2021.

Added to KEVNov 03, 2021

Seraph AlertSame day

Remediation DueNov 17, 2021

ValidationOngoing

Overdue1806 days overdue

Recommended action: Apply vendor remediation guidance.

Seraph Context

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Exploitation Context

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References

https://nvd.nist.gov/vuln/detail/CVE-2021-30665

More from Apple in the KEV catalogue.

CVE-2026-65400macOSAdded Aug 18, 2026 CVE-2025-31277Multiple ProductsAdded Mar 20, 2026 CVE-2025-43520Multiple ProductsAdded Mar 20, 2026

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