CASCACascade Atlas

Evidence dossier

CVE-2021-30952

CVE-2021-30952

62.5–82.5Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Aug 24, 2021
Updated
Mar 6, 2026
Evidence coverage
72%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS7.62%

2026-07-18 · v2026.06.15 · percentile 93.9%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

appleoriginal assertion
container

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.

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

CISA KEVoriginal assertion
observed_exploitation

Apple Multiple Products Integer Overflow or Wraparound Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.076170000000; percentile 0.938830000000

Applicability

Cited product scope

Trace impact →
AppleiOS and iPadOS
[{"status": "affected", "version": "unspecified", "lessThan": "15.2", "versionType": "custom"}]unknown
ApplemacOS
[{"status": "affected", "version": "unspecified", "lessThan": "12.1", "versionType": "custom"}]unknown
ApplemacOS
[{"status": "affected", "version": "unspecified", "lessThan": "15.2", "versionType": "custom"}]unknown
ApplemacOS
[{"status": "affected", "version": "unspecified", "lessThan": "15.2", "versionType": "custom"}]unknown
ApplewatchOS
[{"status": "affected", "version": "unspecified", "lessThan": "8.3", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*; end excluding 15.2supported
Unknown vendorUnknown product
cpe:2.3:a:webkitgtk:webkitgtk:*:*:*:*:*:*:*:*; end excluding 2.34.4supported
Unknown vendorUnknown product
cpe:2.3:a:wpewebkit:wpe_webkit:*:*:*:*:*:*:*:*; end excluding 2.34.4supported
Unknown vendorUnknown product
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*; end excluding 15.2supported
Unknown vendorUnknown product
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*; end excluding 15.2supported
Unknown vendorUnknown product
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*; start including 12.0; end excluding 12.1supported
Unknown vendorUnknown product
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*; end excluding 15.2supported
Unknown vendorUnknown product
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*; end excluding 8.3supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

7.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.