{"history":[{"alert":0,"cve":"CVE-2021-1879","id":22004,"kind":"epss","observed_at":1794500401,"payload":"{\"date\": \"2026-11-12\", \"epss\": 0.07082, \"percentile\": 0.94309}"},{"alert":0,"cve":"CVE-2021-1879","id":19623,"kind":"epss","observed_at":1794327601,"payload":"{\"date\": \"2026-11-10\", \"epss\": 0.07082, \"percentile\": 0.94272}"},{"alert":0,"cve":"CVE-2021-1879","id":17589,"kind":"epss","observed_at":1794241201,"payload":"{\"date\": \"2026-11-09\", \"epss\": 0.07082, \"percentile\": 0.94265}"},{"alert":0,"cve":"CVE-2021-1879","id":15653,"kind":"epss","observed_at":1794154800,"payload":"{\"date\": \"2026-11-08\", \"epss\": 0.07082, \"percentile\": 0.94262}"},{"alert":0,"cve":"CVE-2021-1879","id":13631,"kind":"epss","observed_at":1794068402,"payload":"{\"date\": \"2026-11-07\", \"epss\": 0.07082, \"percentile\": 0.94259}"},{"alert":0,"cve":"CVE-2021-1879","id":11413,"kind":"epss","observed_at":1793982001,"payload":"{\"date\": \"2026-11-06\", \"epss\": 0.07082, \"percentile\": 0.94251}"},{"alert":1,"cve":"CVE-2021-1879","id":9295,"kind":"cna","observed_at":1793917201,"payload":"{\"containers\": {\"adp\": [{\"providerMetadata\": {\"dateUpdated\": \"2024-08-03T16:25:06.324Z\", \"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\"}, \"references\": [{\"tags\": [\"x_refsource_MISC\", \"x_transferred\"], \"url\": \"https://support.apple.com/en-us/HT212256\"}, {\"tags\": [\"x_refsource_MISC\", \"x_transferred\"], \"url\": \"https://support.apple.com/en-us/HT212257\"}, {\"tags\": [\"x_refsource_MISC\", \"x_transferred\"], \"url\": \"https://support.apple.com/en-us/HT212258\"}], \"title\": \"CVE Program Container\"}, {\"metrics\": [{\"cvssV3_1\": {\"attackComplexity\": \"LOW\", \"attackVector\": \"NETWORK\", \"availabilityImpact\": \"NONE\", \"baseScore\": 6.1, \"baseSeverity\": \"MEDIUM\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"scope\": \"CHANGED\", \"userInteraction\": \"REQUIRED\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N\", \"version\": \"3.1\"}}, {\"other\": {\"content\": {\"id\": \"CVE-2021-1879\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"role\": \"CISA Coordinator\", \"timestamp\": \"2025-01-29T17:31:41.503370Z\", \"version\": \"2.0.3\"}, \"type\": \"ssvc\"}}, {\"other\": {\"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879\"}, \"type\": \"kev\"}}], \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-79\", \"description\": \"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')\", \"lang\": \"en\", \"type\": \"CWE\"}]}], \"providerMetadata\": {\"dateUpdated\": \"2025-10-21T23:25:49.688Z\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\"}, \"references\": [{\"tags\": [\"government-resource\"], \"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2021-11-03T00:00:00.000Z\", \"value\": \"CVE-2021-1879 added to CISA KEV\"}], \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"affected\": [{\"product\": \"iOS and iPadOS\", \"vendor\": \"Apple\", \"versions\": [{\"lessThan\": \"14.4\", \"status\": \"affected\", \"version\": \"unspecified\", \"versionType\": \"custom\"}]}, {\"product\": \"iOS\", \"vendor\": \"Apple\", \"versions\": [{\"lessThan\": \"12.5\", \"status\": \"affected\", \"version\": \"unspecified\", \"versionType\": \"custom\"}]}, {\"product\": \"watchOS\", \"vendor\": \"Apple\", \"versions\": [{\"lessThan\": \"7.3\", \"status\": \"affected\", \"version\": \"unspecified\", \"versionType\": \"custom\"}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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..\"}], \"problemTypes\": [{\"descriptions\": [{\"description\": \"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.\", \"lang\": \"en\", \"type\": \"text\"}]}], \"providerMetadata\": {\"dateUpdated\": \"2021-04-02T18:07:52.000Z\", \"orgId\": \"286789f9-fbc2-4510-9f9a-43facdede74c\", \"shortName\": \"apple\"}, \"references\": [{\"tags\": [\"x_refsource_MISC\"], \"url\": \"https://support.apple.com/en-us/HT212256\"}, {\"tags\": [\"x_refsource_MISC\"], \"url\": \"https://support.apple.com/en-us/HT212257\"}, {\"tags\": [\"x_refsource_MISC\"], \"url\": \"https://support.apple.com/en-us/HT212258\"}], \"x_legacyV4Record\": {\"CVE_data_meta\": {\"ASSIGNER\": \"product-security@apple.com\", \"ID\": \"CVE-2021-1879\", \"STATE\": \"PUBLIC\"}, \"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"product_name\": \"iOS and iPadOS\", \"version\": {\"version_data\": [{\"version_affected\": \"<\", \"version_value\": \"14.4\"}]}}, {\"product_name\": \"iOS\", \"version\": {\"version_data\": [{\"version_affected\": \"<\", \"version_value\": \"12.5\"}]}}, {\"product_name\": \"watchOS\", \"version\": {\"version_data\": [{\"version_affected\": \"<\", \"version_value\": \"7.3\"}]}}]}, \"vendor_name\": \"Apple\"}]}}, \"data_format\": \"MITRE\", \"data_type\": \"CVE\", \"data_version\": \"4.0\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"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..\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"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.\"}]}]}, \"references\": {\"reference_data\": [{\"name\": \"https://support.apple.com/en-us/HT212256\", \"refsource\": \"MISC\", \"url\": \"https://support.apple.com/en-us/HT212256\"}, {\"name\": \"https://support.apple.com/en-us/HT212257\", \"refsource\": \"MISC\", \"url\": \"https://support.apple.com/en-us/HT212257\"}, {\"name\": \"https://support.apple.com/en-us/HT212258\", \"refsource\": \"MISC\", \"url\": \"https://support.apple.com/en-us/HT212258\"}]}}}}, \"cveMetadata\": {\"assignerOrgId\": \"286789f9-fbc2-4510-9f9a-43facdede74c\", \"assignerShortName\": \"apple\", \"cveId\": \"CVE-2021-1879\", \"datePublished\": \"2021-04-02T18:07:52.000Z\", \"dateReserved\": \"2020-12-08T00:00:00.000Z\", \"dateUpdated\": \"2025-10-21T23:25:49.688Z\", \"state\": \"PUBLISHED\"}, \"dataType\": \"CVE_RECORD\", \"dataVersion\": \"5.1\"}"},{"alert":0,"cve":"CVE-2021-1879","id":9159,"kind":"epss","observed_at":1793895600,"payload":"{\"date\": \"2026-11-05\", \"epss\": 0.07082, \"percentile\": 0.94246}"},{"alert":0,"cve":"CVE-2021-1879","id":6947,"kind":"epss","observed_at":1793809200,"payload":"{\"date\": \"2026-11-04\", \"epss\": 0.07082, \"percentile\": 0.94242}"},{"alert":0,"cve":"CVE-2021-1879","id":4724,"kind":"epss","observed_at":1793722800,"payload":"{\"date\": \"2026-11-03\", \"epss\": 0.07082, \"percentile\": 0.94232}"},{"alert":0,"cve":"CVE-2021-1879","id":2506,"kind":"epss","observed_at":1793665375,"payload":"{\"date\": \"2026-11-02\", \"epss\": 0.07082, \"percentile\": 0.94224}"},{"alert":1,"cve":"CVE-2021-1879","id":1515,"kind":"kev","observed_at":1793665375,"payload":"{\"cveID\": \"CVE-2021-1879\", \"cwes\": [\"CWE-79\"], \"dateAdded\": \"2021-11-03\", \"dueDate\": \"2021-11-17\", \"forensicTriage\": \"No\", \"knownRansomwareCampaignUse\": \"Unknown\", \"notes\": \"https://nvd.nist.gov/vuln/detail/CVE-2021-1879\", \"product\": \"iOS, iPadOS, and watchOS\", \"requiredAction\": \"Apply updates per vendor instructions.\", \"shortDescription\": \"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.\", \"vendorProject\": \"Apple\", \"vulnerabilityName\": \"Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability\"}"}],"record":{"affected":[{"product":"iOS and iPadOS","vendor":"Apple","versions":[{"lessThan":"14.4","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"iOS","vendor":"Apple","versions":[{"lessThan":"12.5","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"watchOS","vendor":"Apple","versions":[{"lessThan":"7.3","status":"affected","version":"unspecified","versionType":"custom"}]}],"cna":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-03T16:25:06.324Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"tags":["x_refsource_MISC","x_transferred"],"url":"https://support.apple.com/en-us/HT212256"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://support.apple.com/en-us/HT212257"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://support.apple.com/en-us/HT212258"}],"title":"CVE Program Container"},{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}},{"other":{"content":{"id":"CVE-2021-1879","options":[{"Exploitation":"active"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2025-01-29T17:31:41.503370Z","version":"2.0.3"},"type":"ssvc"}},{"other":{"content":{"dateAdded":"2021-11-03","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879"},"type":"kev"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2025-10-21T23:25:49.688Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"references":[{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879"}],"timeline":[{"lang":"en","time":"2021-11-03T00:00:00.000Z","value":"CVE-2021-1879 added to CISA KEV"}],"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"iOS and iPadOS","vendor":"Apple","versions":[{"lessThan":"14.4","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"iOS","vendor":"Apple","versions":[{"lessThan":"12.5","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"watchOS","vendor":"Apple","versions":[{"lessThan":"7.3","status":"affected","version":"unspecified","versionType":"custom"}]}],"descriptions":[{"lang":"en","value":"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.."}],"problemTypes":[{"descriptions":[{"description":"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.","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2021-04-02T18:07:52.000Z","orgId":"286789f9-fbc2-4510-9f9a-43facdede74c","shortName":"apple"},"references":[{"tags":["x_refsource_MISC"],"url":"https://support.apple.com/en-us/HT212256"},{"tags":["x_refsource_MISC"],"url":"https://support.apple.com/en-us/HT212257"},{"tags":["x_refsource_MISC"],"url":"https://support.apple.com/en-us/HT212258"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"product-security@apple.com","ID":"CVE-2021-1879","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"iOS and iPadOS","version":{"version_data":[{"version_affected":"<","version_value":"14.4"}]}},{"product_name":"iOS","version":{"version_data":[{"version_affected":"<","version_value":"12.5"}]}},{"product_name":"watchOS","version":{"version_data":[{"version_affected":"<","version_value":"7.3"}]}}]},"vendor_name":"Apple"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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.."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"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."}]}]},"references":{"reference_data":[{"name":"https://support.apple.com/en-us/HT212256","refsource":"MISC","url":"https://support.apple.com/en-us/HT212256"},{"name":"https://support.apple.com/en-us/HT212257","refsource":"MISC","url":"https://support.apple.com/en-us/HT212257"},{"name":"https://support.apple.com/en-us/HT212258","refsource":"MISC","url":"https://support.apple.com/en-us/HT212258"}]}}}},"cveMetadata":{"assignerOrgId":"286789f9-fbc2-4510-9f9a-43facdede74c","assignerShortName":"apple","cveId":"CVE-2021-1879","datePublished":"2021-04-02T18:07:52.000Z","dateReserved":"2020-12-08T00:00:00.000Z","dateUpdated":"2025-10-21T23:25:49.688Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"cna_checked":1794370801,"cve":"CVE-2021-1879","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..","epss":{"date":"2026-11-12","epss":0.07082,"percentile":0.94309},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"cveID":"CVE-2021-1879","cwes":["CWE-79"],"dateAdded":"2021-11-03","dueDate":"2021-11-17","forensicTriage":"No","knownRansomwareCampaignUse":"Unknown","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-1879","product":"iOS, iPadOS, and watchOS","requiredAction":"Apply updates per vendor instructions.","shortDescription":"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.","vendorProject":"Apple","vulnerabilityName":"Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability"},"kev_checked":1794522003,"products":"Apple iOS and iPadOS, Apple iOS, Apple watchOS","references":["https://support.apple.com/en-us/HT212256","https://support.apple.com/en-us/HT212257","https://support.apple.com/en-us/HT212258","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879"],"score":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","provider":"CISA-ADP","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"solutions":"","state":"PUBLISHED","title":"Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability","updated_at":1794500401,"workarounds":""},"sources":[]}