CASCACascade Atlas

Evidence dossier

CVE-2023-28204

An out-of-bounds read was addressed with improved input validation.

Exploited in the wild (CISA KEV since May 22, 2023). NVD reports CVSS 3.1 6.5. EPSS estimates 14.3% exploit likelihood as of Aug 27, 2026.

70.1–73.1Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.

State
PUBLISHED
Published
Jun 23, 2023
Updated
Oct 21, 2025
Evidence coverage
94%

Evidence chronology

What was known when

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  1. Source dateSource date omittedFirst observed by CASCA
    apple

    Record text: An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.

    Inspect raw assertion
    Field
    container
    Value
    An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 14.29% probability · 96.33th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.142920000000; percentile 0.963260000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date May 22, 2023 · first observed Jul 19, 2026

Exploit likelihood14.29%

FIRST EPSS · score date Aug 27, 2026 · 96.3th percentile · first observed Aug 27, 2026

SeverityCVSS 6.5

NVD · CVSS 3.1 · first observed Jul 19, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

appleOriginal assertion
Record text

An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.

Inspect raw assertion
Field
container
Value
An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

14.29% probability · 96.33th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.142920000000; percentile 0.963260000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
9Underlying assertions
7Canonical products
9Target assertions
0Constraint assertions

Grouped from 2 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

13 scope groups

apple · source assertedAppleiOS and iPadOSDirect source scope
Affected: unspecified to before 15.7 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "15.7", "versionType": "custom"}]
apple · source assertedAppleiOS and iPadOSDirect source scope
Affected: unspecified to before 16.5 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "16.5", "versionType": "custom"}]
apple · source assertedApplemacOSDirect source scope
Affected: unspecified to before 13.4 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "13.4", "versionType": "custom"}]
apple · source assertedAppleSafariDirect source scope
Affected: unspecified to before 16.5 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "16.5", "versionType": "custom"}]
apple · source assertedAppletvOSDirect source scope
Affected: unspecified to before 16.5 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "16.5", "versionType": "custom"}]
apple · source assertedApplewatchOSDirect source scope
Affected: unspecified to before 9.5 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "9.5", "versionType": "custom"}]
NVD CPE · OPERATING SYSTEMappleipadosVulnerable target · 2 assertions
Any version (unconstrained) (< 15.7.6); Any version (unconstrained) (>= 16.0, < 16.5)Canonical identity product-8e7094ac066248cd4828b6ec8e3a96d010ed1c68f6083af46638775d737da0adLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 16.0; through excluding 16.5
    Match ID
    830fa87a-4e89-4e04-a8af-a1ff08d77b2e
  2. cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    through excluding 15.7.6
    Match ID
    4ec9e481-57d3-4f4d-a8d2-7da0272f0706
NVD CPE · OPERATING SYSTEMappleiphone_osVulnerable target · 2 assertions
Any version (unconstrained) (< 15.7.6); Any version (unconstrained) (>= 16.0, < 16.5)Canonical identity product-665d7155d02581979844685e7fca6c2680af997f9200af455887b1c71c483272Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    through excluding 15.7.6
    Match ID
    8b89f737-4add-424c-a946-f368a7abbe6d
  2. cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    from including 16.0; through excluding 16.5
    Match ID
    424f077b-6678-4ce3-a216-c98e6d48f8ac
NVD CPE · OPERATING SYSTEMapplemacosVulnerable target · 1 assertions
Any version (unconstrained) (>= 13.0, < 13.4)Canonical identity product-d6f53ba981bb58ea2b0d24855b8ff4a18555e3a17a9dce0d38460a69537bbc63Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    from including 13.0; through excluding 13.4
    Match ID
    da07361b-d827-471f-9443-4be4265d6a3b
NVD CPE · APPLICATIONapplesafariVulnerable target · 1 assertions
Any version (unconstrained) (< 16.5)Canonical identity product-3c7772db507b09c802755f0f7a9c9fce988300ebb3425947843e4ccbcfe8ffedLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 16.5
    Match ID
    21b2f081-d602-4c84-8343-6327b23176d1
NVD CPE · OPERATING SYSTEMappletvosVulnerable target · 1 assertions
Any version (unconstrained) (< 16.5)Canonical identity product-e5ea88731ef28ba75a5b40a72b650d8199d1f49ce8c4cd688de7cdb41dc8b9fbLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    through excluding 16.5
    Match ID
    d36613a6-bd83-4a57-8ee1-c186eb69dff9
NVD CPE · OPERATING SYSTEMapplewatchosVulnerable target · 1 assertions
Any version (unconstrained) (< 9.5)Canonical identity product-1b28e85eba5cb27cd93d563b4ea63a555b916484cee543c65fdbe57d529fc0d1Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    through excluding 9.5
    Match ID
    be5db973-7b51-4232-8e1d-231078fe275c
NVD CPE · APPLICATIONwebkitgtkwebkitgtk+Vulnerable target · 1 assertions
Any version (unconstrained) (< 2.42.3)Canonical identity product-512d40816d7f70ea0f0496be1beb732b0d8ceefdb9d8578251216bc90825615fLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:a:webkitgtk:webkitgtk\+:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 2.42.3
    Match ID
    8c7f88f0-0092-4338-a52f-1a2ed27460b5

Affected-product evidence

Accepted scope and product mapping

7 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-d6ed6f1e35de2e16a8a10f2ae364dab009bb2afadd609071b20da24d60ce2829 · product-1b28e85eba5cb27cd93d563b4ea63a555b916484cee543c65fdbe57d529fc0d1

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
c174647a-1f6e-4c87-a8f3-6290f44360ae
Mapping establishedEvidence supported

vendor-d6ed6f1e35de2e16a8a10f2ae364dab009bb2afadd609071b20da24d60ce2829 · product-3c7772db507b09c802755f0f7a9c9fce988300ebb3425947843e4ccbcfe8ffed

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
70fca1e8-78dc-4571-acef-7ca9618c4d72
Mapping establishedEvidence supported

vendor-8a3761f813854c6096cdd0ed4224503801e6abd1d5feb7a2d17b5429feac12b1 · product-512d40816d7f70ea0f0496be1beb732b0d8ceefdb9d8578251216bc90825615f

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
2c9807a2-d3b4-41fd-8012-a5175a6644b2
Mapping establishedEvidence supported

vendor-d6ed6f1e35de2e16a8a10f2ae364dab009bb2afadd609071b20da24d60ce2829 · product-665d7155d02581979844685e7fca6c2680af997f9200af455887b1c71c483272

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
883d1175-dcf0-4323-9756-bfdcc99ba638d04618e1-0920-4b5a-89d0-9924a2d01286
Mapping establishedEvidence supported

vendor-d6ed6f1e35de2e16a8a10f2ae364dab009bb2afadd609071b20da24d60ce2829 · product-8e7094ac066248cd4828b6ec8e3a96d010ed1c68f6083af46638775d737da0ad

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
25e2093c-8896-400c-af42-ef199b098f758006f51f-287e-4c42-97a5-4e42c0edbeeb
Mapping establishedEvidence supported

vendor-d6ed6f1e35de2e16a8a10f2ae364dab009bb2afadd609071b20da24d60ce2829 · product-d6f53ba981bb58ea2b0d24855b8ff4a18555e3a17a9dce0d38460a69537bbc63

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
d1d3a01e-3c4f-410b-85cf-7cd5d6534639
Mapping establishedEvidence supported

vendor-d6ed6f1e35de2e16a8a10f2ae364dab009bb2afadd609071b20da24d60ce2829 · product-e5ea88731ef28ba75a5b40a72b650d8199d1f49ce8c4cd688de7cdb41dc8b9fb

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
26b0300f-0c49-465b-aff3-37d0b81b75a7
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
6
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
0d102016-383f-4112-bec0-67422813d2012f23a399-5d81-419b-84c5-b1439dbf290d315c4cd1-e6a2-4927-ac4b-5a0b55bdf638451ddeab-6ce2-45a8-b73c-bc0019619ccd95a71949-5a47-4c1d-bd10-99704ce3db77fb8525e7-f675-446a-9b47-d9dd41ae2e9d

Assessments

CVSS by origin

6.5
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
6.5
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
6.5
CISA-ADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Direct CVE/CNA normalized decisions

6.5Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Validation
Valid match
Recomputed
6.5
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • 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; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • 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.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.