November 3, 2021 · Applied Cybernetics Group
CVE-2021-1879 — Apple iOS, iPadOS, and watchOS
Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Apple
- Product
- iOS, iPadOS, and watchOS
- EPSS
- 93.5th percentile (score 0.071, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-1879
CISA short description
Apple iOS, iPadOS, and watchOS WebKit contain an unspecified vulnerability that allows for universal cross-site scripting (XSS) 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.