CVE-2021-30952 (GCVE-0-2021-30952)

Vulnerability from cvelistv5 – Published: 2021-08-24 18:50 – Updated: 2026-03-06 05:01
VLAI? CISA KEV
Summary
An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.
Severity ?
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
  • Processing maliciously crafted web content may lead to arbitrary code execution
Assigner
References
Impacted products
Vendor Product Version
Apple watchOS Affected: unspecified , < 8.3 (custom)
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    Apple iOS and iPadOS Affected: unspecified , < 15.2 (custom)
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    Apple macOS Affected: unspecified , < 12.1 (custom)
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    Apple macOS Affected: unspecified , < 15.2 (custom)
Create a notification for this product.
    Apple macOS Affected: unspecified , < 15.2 (custom)
Create a notification for this product.
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 379199da-aea6-4ca8-b09f-48e2998d1109

Vulnerability ID: CVE-2021-30952

Status: Confirmed

Status Updated: 2026-03-05 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-03-05
Asserted: 2026-03-05
Scope
Notes: KEV entry: Apple Multiple Products Integer Overflow or Wraparound Vulnerability | Affected: Apple / Multiple Products | Description: Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-03-26 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://support.apple.com/en-us/HT212975 ; https://support.apple.com/en-us/HT212976 ; https://support.apple.com/en-us/HT212978 ; https://support.apple.com/en-us/HT212980 ; https://support.apple.com/en-us/HT212982 ; https://nvd.nist.gov/vuln/detail/CVE-2021-30952
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-190
Feed CISA Known Exploited Vulnerabilities Catalog
Product Multiple Products
Due Date 2026-03-26
Date Added 2026-03-05
Vendorproject Apple
Vulnerabilityname Apple Multiple Products Integer Overflow or Wraparound Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-03-05 20:00 UTC | Updated: 2026-03-05 20:00 UTC
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Processing maliciously crafted web content may lead to arbitrary code execution.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"Processing maliciously crafted web content may lead to arbitrary code execution\"}]}], \"providerMetadata\": {\"orgId\": \"286789f9-fbc2-4510-9f9a-43facdede74c\", \"shortName\": \"apple\", \"dateUpdated\": \"2022-02-06T03:06:35.000Z\"}, \"x_legacyV4Record\": {\"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"version\": {\"version_data\": [{\"version_value\": \"8.3\", \"version_affected\": \"\u003c\"}]}, \"product_name\": \"watchOS\"}, {\"version\": {\"version_data\": [{\"version_value\": \"15.2\", \"version_affected\": \"\u003c\"}]}, \"product_name\": \"iOS and iPadOS\"}, {\"version\": {\"version_data\": [{\"version_value\": \"12.1\", \"version_affected\": \"\u003c\"}]}, \"product_name\": \"macOS\"}, {\"version\": {\"version_data\": [{\"version_value\": \"15.2\", \"version_affected\": \"\u003c\"}]}, \"product_name\": \"macOS\"}, {\"version\": {\"version_data\": [{\"version_value\": \"15.2\", \"version_affected\": \"\u003c\"}]}, \"product_name\": \"macOS\"}]}, \"vendor_name\": \"Apple\"}]}}, \"data_type\": \"CVE\", \"references\": {\"reference_data\": [{\"url\": \"https://support.apple.com/en-us/HT212975\", \"name\": \"https://support.apple.com/en-us/HT212975\", \"refsource\": \"MISC\"}, {\"url\": \"https://support.apple.com/en-us/HT212976\", \"name\": \"https://support.apple.com/en-us/HT212976\", \"refsource\": \"MISC\"}, {\"url\": \"https://support.apple.com/en-us/HT212978\", \"name\": \"https://support.apple.com/en-us/HT212978\", \"refsource\": \"MISC\"}, {\"url\": \"https://support.apple.com/en-us/HT212980\", \"name\": \"https://support.apple.com/en-us/HT212980\", \"refsource\": \"MISC\"}, {\"url\": \"https://support.apple.com/en-us/HT212982\", \"name\": \"https://support.apple.com/en-us/HT212982\", \"refsource\": \"MISC\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2022/01/21/2\", \"name\": \"[oss-security] 20220121 WebKitGTK and WPE WebKit Security Advisory WSA-2022-0001\", \"refsource\": \"MLIST\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/\", \"name\": \"FEDORA-2022-25a98f5d55\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://www.debian.org/security/2022/dsa-5061\", \"name\": \"DSA-5061\", \"refsource\": \"DEBIAN\"}, {\"url\": \"https://www.debian.org/security/2022/dsa-5060\", \"name\": \"DSA-5060\", \"refsource\": \"DEBIAN\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/\", \"name\": \"FEDORA-2022-f7366e60cb\", \"refsource\": \"FEDORA\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"An integer overflow was addressed with improved input validation. 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      "cveMetadata": "{\"cveId\": \"CVE-2021-30952\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-06T05:01:17.601Z\", \"dateReserved\": \"2021-04-13T00:00:00.000Z\", \"assignerOrgId\": \"286789f9-fbc2-4510-9f9a-43facdede74c\", \"datePublished\": \"2021-08-24T18:50:52.000Z\", \"assignerShortName\": \"apple\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.




Sightings

Author Source Type Date

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.