Exploitation evidence
Known exploited · CISA KEV listed
Added 2021-11-03. Ransomware campaign use: Unknown.
CISA required action: Apply updates per vendor instructions.
CISA due date: 2021-11-17. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Apple / macOS
Default status: Not specified
- affected: unspecified to < 11.6 (custom)
Apple / iOS
Default status: Not specified
- affected: unspecified to < 14.8 (custom)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://support.apple.com/en-us/HT212804
- https://support.apple.com/en-us/HT212807
- http://seclists.org/fulldisclosure/2021/Sep/27
- http://seclists.org/fulldisclosure/2021/Sep/25
- http://seclists.org/fulldisclosure/2021/Sep/29
- http://www.openwall.com/lists/oss-security/2021/09/20/1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/
- http://seclists.org/fulldisclosure/2021/Sep/38
- http://seclists.org/fulldisclosure/2021/Sep/39
- https://www.debian.org/security/2021/dsa-4975
- https://www.debian.org/security/2021/dsa-4976
- https://support.apple.com/kb/HT212824
- http://seclists.org/fulldisclosure/2021/Sep/50
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/
- http://www.openwall.com/lists/oss-security/2021/10/26/9
- http://www.openwall.com/lists/oss-security/2021/10/27/1
- http://www.openwall.com/lists/oss-security/2021/10/27/2
- http://www.openwall.com/lists/oss-security/2021/10/27/4
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.13379,
"percentile": 0.96473
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.13379,
"percentile": 0.9645
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.13379,
"percentile": 0.96447
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.13379,
"percentile": 0.96446
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.13379,
"percentile": 0.96443
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.13379,
"percentile": 0.96438
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.13379,
"percentile": 0.96434
}05 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-03T22:48:13.458Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://support.apple.com/en-us/HT212804"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://support.apple.com/en-us/HT212807"
},
{
"name": "20210917 APPLE-SA-2021-09-13-3 macOS Big Sur 11.6",
"tags": [
"mailing-list",
"x_refsource_FULLDISC",
"x_transferred"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/27"
},
{
"name": "20210917 APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8",
"tags": [
"mailing-list",
"x_refsource_FULLDISC",
"x_transferred"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/25"
},
{
"name": "20210917 APPLE-SA-2021-09-13-5 Safari 14.1.2",
"tags": [
"mailing-list",
"x_refsource_FULLDISC",
"x_transferred"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/29"
},
{
"name": "[oss-security] 20210920 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0005",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2021/09/20/1"
},
{
"name": "FEDORA-2021-c00e45b6c0",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/"
},
{
"name": "20210921 APPLE-SA-2021-09-20-6 Additional information for APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8",
"tags": [
"mailing-list",
"x_refsource_FULLDISC",
"x_transferred"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/38"
},
{
"name": "20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6",
"tags": [
"mailing-list",
"x_refsource_FULLDISC",
"x_transferred"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/39"
},
{
"name": "DSA-4975",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN",
"x_transferred"
],
"url": "https://www.debian.org/security/2021/dsa-4975"
},
{
"name": "DSA-4976",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN",
"x_transferred"
],
"url": "https://www.debian.org/security/2021/dsa-4976"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://support.apple.com/kb/HT212824"
},
{
"name": "20210924 APPLE-SA-2021-09-23-1 iOS 12.5.5",
"tags": [
"mailing-list",
"x_refsource_FULLDISC",
"x_transferred"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/50"
},
{
"name": "FEDORA-2021-edf6957b7d",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/"
},
{
"name": "[oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/26/9"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/1"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/2"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/4"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-30858",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-01-29T17:31:17.221055Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-21T23:25:37.307Z",
"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-2021-30858"
}
],
"timeline": [
{
"lang": "en",
"time": "2021-11-03T00:00:00.000Z",
"value": "CVE-2021-30858 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "macOS",
"vendor": "Apple",
"versions": [
{
"lessThan": "11.6",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "iOS",
"vendor": "Apple",
"versions": [
{
"lessThan": "14.8",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. 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 arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2021-10-27T20:06:21.000Z",
"orgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
"shortName": "apple"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://support.apple.com/en-us/HT212804"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://support.apple.com/en-us/HT212807"
},
{
"name": "20210917 APPLE-SA-2021-09-13-3 macOS Big Sur 11.6",
"tags": [
"mailing-list",
"x_refsource_FULLDISC"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/27"
},
{
"name": "20210917 APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8",
"tags": [
"mailing-list",
"x_refsource_FULLDISC"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/25"
},
{
"name": "20210917 APPLE-SA-2021-09-13-5 Safari 14.1.2",
"tags": [
"mailing-list",
"x_refsource_FULLDISC"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/29"
},
{
"name": "[oss-security] 20210920 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0005",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "http://www.openwall.com/lists/oss-security/2021/09/20/1"
},
{
"name": "FEDORA-2021-c00e45b6c0",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/"
},
{
"name": "20210921 APPLE-SA-2021-09-20-6 Additional information for APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8",
"tags": [
"mailing-list",
"x_refsource_FULLDISC"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/38"
},
{
"name": "20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6",
"tags": [
"mailing-list",
"x_refsource_FULLDISC"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/39"
},
{
"name": "DSA-4975",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN"
],
"url": "https://www.debian.org/security/2021/dsa-4975"
},
{
"name": "DSA-4976",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN"
],
"url": "https://www.debian.org/security/2021/dsa-4976"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://support.apple.com/kb/HT212824"
},
{
"name": "20210924 APPLE-SA-2021-09-23-1 iOS 12.5.5",
"tags": [
"mailing-list",
"x_refsource_FULLDISC"
],
"url": "http://seclists.org/fulldisclosure/2021/Sep/50"
},
{
"name": "FEDORA-2021-edf6957b7d",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/"
},
{
"name": "[oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/26/9"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/1"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/2"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/4"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "product-security@apple.com",
"ID": "CVE-2021-30858",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "macOS",
"version": {
"version_data": [
{
"version_affected": "<",
"version_value": "11.6"
}
]
}
},
{
"product_name": "iOS",
"version": {
"version_data": [
{
"version_affected": "<",
"version_value": "14.8"
}
]
}
}
]
},
"vendor_name": "Apple"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. 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 arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited."
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://support.apple.com/en-us/HT212804",
"refsource": "MISC",
"url": "https://support.apple.com/en-us/HT212804"
},
{
"name": "https://support.apple.com/en-us/HT212807",
"refsource": "MISC",
"url": "https://support.apple.com/en-us/HT212807"
},
{
"name": "20210917 APPLE-SA-2021-09-13-3 macOS Big Sur 11.6",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2021/Sep/27"
},
{
"name": "20210917 APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2021/Sep/25"
},
{
"name": "20210917 APPLE-SA-2021-09-13-5 Safari 14.1.2",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2021/Sep/29"
},
{
"name": "[oss-security] 20210920 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0005",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/09/20/1"
},
{
"name": "FEDORA-2021-c00e45b6c0",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/"
},
{
"name": "20210921 APPLE-SA-2021-09-20-6 Additional information for APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2021/Sep/38"
},
{
"name": "20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2021/Sep/39"
},
{
"name": "DSA-4975",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2021/dsa-4975"
},
{
"name": "DSA-4976",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2021/dsa-4976"
},
{
"name": "https://support.apple.com/kb/HT212824",
"refsource": "CONFIRM",
"url": "https://support.apple.com/kb/HT212824"
},
{
"name": "20210924 APPLE-SA-2021-09-23-1 iOS 12.5.5",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2021/Sep/50"
},
{
"name": "FEDORA-2021-edf6957b7d",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/"
},
{
"name": "[oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/10/26/9"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/1"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/2"
},
{
"name": "[oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/10/27/4"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
"assignerShortName": "apple",
"cveId": "CVE-2021-30858",
"datePublished": "2021-08-24T18:49:23.000Z",
"dateReserved": "2021-04-13T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:25:37.307Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.13379,
"percentile": 0.96431
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.13379,
"percentile": 0.96425
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.13379,
"percentile": 0.9642
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2021-30858",
"cwes": [
"CWE-416"
],
"dateAdded": "2021-11-03",
"dueDate": "2021-11-17",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-30858",
"product": "iOS, iPadOS, and macOS",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "Apple iOS, iPadOS, and macOS WebKit contain a use-after-free vulnerability that leads to code execution 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, macOS Use-After-Free Vulnerability"
}