CVE-2021-1879
Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability
Summary
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.
Affected software
Vendor: Apple · Product: iOS, iPadOS, and watchOS
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Apple
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2021-30860 | Apple Multiple Products Integer Overflow Vulnerability | 76.0% | Yes |
| CVE-2021-30657 | Apple macOS Unspecified Vulnerability | 68.5% | Yes |
| CVE-2016-4657 | Apple iOS Webkit Memory Corruption Vulnerability | 66.8% | Yes |
| CVE-2025-43300 | Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability | 65.2% | Yes |
| CVE-2023-41064 | Apple iOS, iPadOS, and macOS ImageIO Buffer Overflow Vulnerability | 53.4% | Yes |
| CVE-2023-32434 | Apple Multiple Products Integer Overflow Vulnerability | 51.5% | Yes |
| CVE-2014-4404 | Apple OS X Heap-Based Buffer Overflow Vulnerability | 48.9% | Yes |
| CVE-2016-4655 | Apple iOS Information Disclosure Vulnerability | 33.4% | Yes |
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Get your free reportSources: CISA KEV catalog · NVD · FIRST EPSS
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