{"affected":[{"affectedData":[{"product":"iOS and iPadOS","vendor":"Apple","versions":[{"lessThan":"14.5","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"tvOS","vendor":"Apple","versions":[{"lessThan":"14.5","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"watchOS","vendor":"Apple","versions":[{"lessThan":"7.4","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"macOS","vendor":"Apple","versions":[{"lessThan":"11.3","status":"affected","version":"unspecified","versionType":"custom"}]}],"source":"product-security@apple.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*","matchCriteriaId":"3EAAE2C1-EF21-4567-99F1-335D1EF955D1","versionEndExcluding":"14.5","vulnerable":true},{"criteria":"cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*","matchCriteriaId":"C1E12568-6F17-458F-8216-3D6DBC8F6DEE","versionEndExcluding":"14.5","vulnerable":true},{"criteria":"cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*","matchCriteriaId":"4E699CCC-31F5-458E-A59C-79B3AF143747","versionEndExcluding":"11.3","versionStartIncluding":"11.0","vulnerable":true},{"criteria":"cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*","matchCriteriaId":"D5B77841-F161-47AB-8043-3E0346E3AA25","versionEndExcluding":"14.5","vulnerable":true},{"criteria":"cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*","matchCriteriaId":"CFFFE00C-0AA6-4F60-ABF4-E68877BFD8F8","versionEndExcluding":"7.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may result in the disclosure of process memory."},{"lang":"es","value":"Se abordó un problema de inicialización de la memoria con un manejo de la memoria mejorada. Este problema se corrigió en macOS Big Sur versión 11.3, iOS versión 14.5 e iPadOS versión 14.5, watchOS versión 7.4, tvOS versión 14.5. El procesamiento de contenido web diseñado maliciosamente puede resultar en una divulgación de la memoria del proceso"}],"id":"CVE-2021-1820","lastModified":"2026-06-17T03:32:37.103","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"MEDIUM","cvssData":{"accessComplexity":"MEDIUM","accessVector":"NETWORK","authentication":"NONE","availabilityImpact":"NONE","baseScore":4.3,"confidentialityImpact":"PARTIAL","integrityImpact":"NONE","vectorString":"AV:N/AC:M/Au:N/C:P/I:N/A:N","version":"2.0"},"exploitabilityScore":8.6,"impactScore":2.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":true}],"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","version":"3.1"},"exploitabilityScore":2.8,"impactScore":3.6,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2021-09-08T15:15:09.993","references":[{"source":"product-security@apple.com","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212317"},{"source":"product-security@apple.com","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212323"},{"source":"product-security@apple.com","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212324"},{"source":"product-security@apple.com","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212325"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212317"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212323"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212324"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://support.apple.com/en-us/HT212325"}],"sourceIdentifier":"product-security@apple.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-665"}],"source":"nvd@nist.gov","type":"Primary"}]}