Coverage › CVE-2021-30663
CVE-2021-30663 Unmapped
Apple Multiple Products WebKit Integer Overflow Vulnerability
- Vendor / product
- Apple — Multiple Products
- Description (CISA)
- Apple iOS, iPadOS, macOS, tvOS, and Safari WebKit contain an integer 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.
- Added to KEV
- 2021-11-03
- Due date
- 2021-11-17
- Required action
- Apply updates per vendor instructions.
- Known ransomware use
- Unknown
- CWE
- CWE-20, CWE-190
- CISA notes
- https://nvd.nist.gov/vuln/detail/CVE-2021-30663
- Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2021-30663. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE (CWE-20, CWE-190) — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.