CVE-2021-30952 (GCVE-0-2021-30952)
Vulnerability from cvelistv5 – Published: 2021-08-24 18:50 – Updated: 2026-03-06 05:01Summary
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)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-05 00:00 UTC
CWE
- Processing maliciously crafted web content may lead to arbitrary code execution
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://support.apple.com/en-us/HT212975 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212976 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212978 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212980 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212982 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/01/21/2 | mailing-listx_refsource_MLIST |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.debian.org/security/2022/dsa-5061 | vendor-advisoryx_refsource_DEBIAN |
| https://www.debian.org/security/2022/dsa-5060 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://cloud.google.com/blog/topics/threat-intel… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 379199da-aea6-4ca8-b09f-48e2998d1109
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
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 17ec408c-16e0-4ff1-a8b1-76a3fa3064fc
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: 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... | Affected: Apple / watchOS, iOS and iPadOS, macOS | CVSS: 7.8 (HIGH) | EPSS: 0.07617 | 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 | 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... |
| Vendor | Apple |
| Product | watchOS, iOS and iPadOS, macOS |
| Added Date | 2026-06-01T11:38:00.160Z |
| Cvss Score | 7.8 |
| Epss Score | 0.07617 |
| Cvss Severity | HIGH |
| Epss Percentile | 0.9378 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:03 UTC
| Updated: 2026-07-10 06:14 UTC
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"published": "2021-08-24T19:15:21.777",
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"current_release_date": "2026-03-06T02:41:39+00:00",
"cve": "CVE-2021-30952",
"id": "CVE-2021-30952",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:fixed": "70",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "webkitgtk: Processing maliciously crafted web content may lead to arbitrary code execution",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-30952.json",
"version": "3"
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"id": "CVE-2021-30952",
"initial_release_date": "2023-02-15T03:41:30Z",
"product_status:known_not_affected": "9",
"product_status:recommended": "911",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-30952",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-30952.json",
"version": "17"
},
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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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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