CVE-2021-1879: Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability
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.
| Vendor | Apple |
|---|---|
| Product | iOS, iPadOS, and watchOS |
| Date added to KEV | 2021-11-03 |
| Due date (BOD 22-01) | 2021-11-17 |
| Known ransomware campaign use | Unknown |
| CWE | CWE-79 |
| Required action | Apply updates per vendor instructions. |
What to do
- Identify every instance of Apple iOS, iPadOS, and watchOS in your environment (asset inventory, EDR, vulnerability scanner).
- Apply CISA's required action: Apply updates per vendor instructions.
- Federal civilian agencies must act by 2021-11-17 under BOD 22-01; other organizations can use the same date as a target.
- Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.
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Sources
- NVD entry for CVE-2021-1879 (severity scores, if any, live there)
- CISA KEV catalog entry
- https://nvd.nist.gov/vuln/detail/CVE-2021-1879