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CVE-2021-30858 (GCVE-0-2021-30858)

Vulnerability from cvelistv5 – Published: 2021-08-24 18:49 – Updated: 2025-10-21 23:25
VLAI CISA Previdian
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-29 17:31 UTC
CWE
  • 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.
  • CWE-416 - Use After Free
Assigner
References
URL Tags
https://support.apple.com/en-us/HT212804 x_refsource_MISC
https://support.apple.com/en-us/HT212807 x_refsource_MISC
http://seclists.org/fulldisclosure/2021/Sep/27 mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2021/Sep/25 mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2021/Sep/29 mailing-listx_refsource_FULLDISC
http://www.openwall.com/lists/oss-security/2021/09/20/1 mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://seclists.org/fulldisclosure/2021/Sep/38 mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2021/Sep/39 mailing-listx_refsource_FULLDISC
https://www.debian.org/security/2021/dsa-4975 vendor-advisoryx_refsource_DEBIAN
https://www.debian.org/security/2021/dsa-4976 vendor-advisoryx_refsource_DEBIAN
https://support.apple.com/kb/HT212824 x_refsource_CONFIRM
http://seclists.org/fulldisclosure/2021/Sep/50 mailing-listx_refsource_FULLDISC
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2021/10/26/9 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/27/1 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/27/2 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/27/4 mailing-listx_refsource_MLIST
https://www.cisa.gov/known-exploited-vulnerabilit… government-resource
Impacted products
Vendor Product Version CPE status
Apple macOS Affected: unspecified , < 11.6 (custom)
guessed Create a notification for this product.
Apple iOS Affected: unspecified , < 14.8 (custom)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 97c8b60f-21cf-4ec5-b190-5b8ad6d14e7b

Vulnerability ID: CVE-2021-30858

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Apple iOS, iPadOS, macOS Use-After-Free Vulnerability | Affected: Apple / iOS, iPadOS, and macOS | Description: 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. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-30858
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-416
Feed CISA Known Exploited Vulnerabilities Catalog
Product iOS, iPadOS, and macOS
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject Apple
Vulnerabilityname Apple iOS, iPadOS, macOS Use-After-Free Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:26 UTC | Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 2e874c2f-7132-47fd-a177-6d306f97c7d2

Vulnerability ID: CVE-2021-30858

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: 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.... | Affected: Apple / macOS, iOS | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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....
Vendor Apple
Product macOS, iOS
Added Date 2021-11-03T00:00:00.000Z
Cvss Score 8.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC
Show details on NVD website
To clipboard 

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\"https://support.apple.com/en-us/HT212807\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/Sep/27\", \"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/25\", \"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/29\", \"name\": \"20210917 APPLE-SA-2021-09-13-5 Safari 14.1.2\", \"tags\": [\"mailing-list\", \"x_refsource_FULLDISC\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/09/20/1\", \"name\": \"[oss-security] 20210920 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0005\", \"tags\": [\"mailing-list\", \"x_refsource_MLIST\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/\", \"name\": \"FEDORA-2021-c00e45b6c0\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/Sep/38\", \"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/39\", \"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\": \"https://www.debian.org/security/2021/dsa-4975\", \"name\": \"DSA-4975\", \"tags\": [\"vendor-advisory\", \"x_refsource_DEBIAN\"]}, {\"url\": \"https://www.debian.org/security/2021/dsa-4976\", \"name\": \"DSA-4976\", \"tags\": [\"vendor-advisory\", \"x_refsource_DEBIAN\"]}, {\"url\": \"https://support.apple.com/kb/HT212824\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/Sep/50\", \"name\": \"20210924 APPLE-SA-2021-09-23-1 iOS 12.5.5\", \"tags\": [\"mailing-list\", \"x_refsource_FULLDISC\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/\", \"name\": \"FEDORA-2021-edf6957b7d\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/10/26/9\", \"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/2021/10/27/1\", \"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 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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.\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2021-30858\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"product-security@apple.com\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-30858\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:25:37.307Z\", \"dateReserved\": \"2021-04-13T00:00:00.000Z\", \"assignerOrgId\": \"286789f9-fbc2-4510-9f9a-43facdede74c\", \"datePublished\": \"2021-08-24T18:49:23.000Z\", \"assignerShortName\": \"apple\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.