{"cve":"CVE-2021-1879","nvd":{"published":"2021-04-02T19:15:20.770","modified":"2026-06-17T03:32:42.883","status":"Analyzed","description":"This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. Apple is aware of a report that this issue may have been actively exploited..","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://support.apple.com/en-us/HT212256","https://support.apple.com/en-us/HT212257","https://support.apple.com/en-us/HT212258","https://support.apple.com/en-us/HT212256","https://support.apple.com/en-us/HT212257"],"products":["apple:ipados","apple:iphone_os","apple:watchos"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-1879","score":0.07082,"percentile":0.94223,"date":"2026-10-31"},"kev":{"cve":"CVE-2021-1879","date_added":"2021-11-03","due_date":"2021-11-17","vendor":"Apple","product":"iOS, iPadOS, and watchOS","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}