November 3, 2021 · Applied Cybernetics Group
CVE-2021-30666 — Apple iOS
Apple iOS WebKit Buffer Overflow Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Apple
- Product
- iOS
- EPSS
- 79.1th percentile (score 0.012, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-30666
CISA short description
Apple iOS WebKit contains a buffer-overflow 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.
Required action
Apply updates per vendor instructions.