CASCACascade Atlas

Evidence dossier

CVE-2018-8653

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption…

Exploited in the wild (CISA KEV since Nov 3, 2021). NVD reports CVSS 3.1 7.5. EPSS estimates 29.8% exploit likelihood as of Aug 27, 2026.

72.3–75.8Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8643.

State
PUBLISHED
Published
Dec 20, 2018
Updated
Oct 21, 2025
Evidence coverage
92%

Evidence chronology

What was known when

Download this view's receipt →
  1. 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 ↗
  2. 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 ↗
  3. Source dateSource date omittedFirst observed by CASCA
    microsoft

    Record text: A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8643.

    Inspect raw assertion
    Field
    container
    Value
    A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8643.
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 29.82% probability · 98.06th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.298220000000; percentile 0.980620000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Nov 3, 2021 · first observed Jul 19, 2026

Exploit likelihood29.82%

FIRST EPSS · score date Aug 27, 2026 · 98.1th percentile · first observed Aug 27, 2026

SeverityCVSS 7.5

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

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 ↗
microsoftOriginal assertion
Record text

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8643.

Inspect raw assertion
Field
container
Value
A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8643.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

29.82% probability · 98.06th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.298220000000; percentile 0.980620000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
18Underlying assertions
14Canonical products
3Target assertions
15Constraint assertions

Grouped from 6 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

17 scope groups

microsoft · source assertedMicrosoftInternet Explorer 10Direct source scope
Affected: Windows Server 2012
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "Windows Server 2012"}]
microsoft · source assertedMicrosoftInternet Explorer 11Direct source scope
Affected: Windows 10 for 32-bit SystemsAffected: Windows 10 for x64-based SystemsAffected: Windows 10 Version 1607 for 32-bit SystemsAffected: Windows 10 Version 1607 for x64-based SystemsAffected: Windows 10 Version 1703 for 32-bit SystemsAffected: Windows 10 Version 1703 for x64-based SystemsAffected: Windows 10 Version 1709 for 32-bit SystemsAffected: Windows 10 Version 1709 for ARM64-based SystemsAffected: Windows 10 Version 1709 for x64-based SystemsAffected: Windows 10 Version 1803 for 32-bit SystemsAffected: Windows 10 Version 1803 for ARM64-based SystemsAffected: Windows 10 Version 1803 for x64-based SystemsAffected: Windows 10 Version 1809 for 32-bit SystemsAffected: Windows 10 Version 1809 for ARM64-based SystemsAffected: Windows 10 Version 1809 for x64-based SystemsAffected: Windows 7 for 32-bit Systems Service Pack 1Affected: Windows 7 for x64-based Systems Service Pack 1Affected: Windows 8.1 for 32-bit systemsAffected: Windows 8.1 for x64-based systemsAffected: Windows RT 8.1Affected: Windows Server 2008 R2 for x64-based Systems Service Pack 1Affected: Windows Server 2012 R2Affected: Windows Server 2016Affected: Windows Server 2019
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "Windows 10 for 32-bit Systems"}, {"status": "affected", "version": "Windows 10 for x64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1607 for 32-bit Systems"}, {"status": "affected", "version": "Windows 10 Version 1607 for x64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1703 for 32-bit Systems"}, {"status": "affected", "version": "Windows 10 Version 1703 for x64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1709 for 32-bit Systems"}, {"status": "affected", "version": "Windows 10 Version 1709 for ARM64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1709 for x64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1803 for 32-bit Systems"}, {"status": "affected", "version": "Windows 10 Version 1803 for ARM64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1803 for x64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1809 for 32-bit Systems"}, {"status": "affected", "version": "Windows 10 Version 1809 for ARM64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1809 for x64-based Systems"}, {"status": "affected", "version": "Windows 7 for 32-bit Systems Service Pack 1"}, {"status": "affected", "version": "Windows 7 for x64-based Systems Service Pack 1"}, {"status": "affected", "version": "Windows 8.1 for 32-bit systems"}, {"status": "affected", "version": "Windows 8.1 for x64-based systems"}, {"status": "affected", "version": "Windows RT 8.1"}, {"status": "affected", "version": "Windows Server 2008 R2 for x64-based Systems Service Pack 1"}, {"status": "affected", "version": "Windows Server 2012 R2"}, {"status": "affected", "version": "Windows Server 2016"}, {"status": "affected", "version": "Windows Server 2019"}]
microsoft · source assertedMicrosoftInternet Explorer 9Direct source scope
Affected: Windows Server 2008 for 32-bit Systems Service Pack 2Affected: Windows Server 2008 for x64-based Systems Service Pack 2
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "Windows Server 2008 for 32-bit Systems Service Pack 2"}, {"status": "affected", "version": "Windows Server 2008 for x64-based Systems Service Pack 2"}]
NVD CPE · APPLICATIONmicrosoftinternet_explorerVulnerable target · 3 assertions
Version 10; Version 11; Version 9Canonical identity product-d26e3505f2452daa926474c7ca23fc78f73a7b20902783174428ff8d6e276baaLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    2 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d7809f78-8d56-4925-a8f9-4119b973a667
  2. cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    c043eddd-41bf-4718-bdcf-158bbbdb6360
  3. cpe:2.3:a:microsoft:internet_explorer:10:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d5808661-a082-4cbe-808c-b253972487b4
NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1507Environmental constraint · 1 assertions
Version not applicableCanonical identity product-9851bd571b8ab08bca589cd73710badfef557d036f0fb7707f694f1c9f597cb4Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    542daeec-73cc-46c6-a630-bf474a3446ac
NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1607Environmental constraint · 1 assertions
Any version (unconstrained)Canonical identity product-740fec3e9838b5eabe76ebe27e4d0d7a4cb2e0ef7e13923300d3d0b51e3fce1cLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b4a637d6-78d0-400d-82a4-fdefced069b1
NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1703Environmental constraint · 1 assertions
Any version (unconstrained)Canonical identity product-2f3550a8fd2528ab6e756c5ea638f5f3dc368adee47ca6f01d64918c0b9eb2a5Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_10_1703:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    17a026a3-f59c-48f5-9834-5fb054642136
NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1709Environmental constraint · 1 assertions
Any version (unconstrained)Canonical identity product-d059dbfcd39652adfca6d48669484008cb5d4a8b33116c81ee002cd9101904afLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_10_1709:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    180ebe38-18cf-4298-8f9b-9457a31e2ff3
NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1803Environmental constraint · 1 assertions
Any version (unconstrained)Canonical identity product-5e821ea3746af154a469c180e78b9f4d663edf21461517987eed76740c7910c1Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_10_1803:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    102319f6-1c4b-4359-8ffd-d104ff5b1c51
NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1809Environmental constraint · 1 assertions
Any version (unconstrained)Canonical identity product-a3084138383423221f61594e86f5b295e5e254acd7ae5284f45e0877a084db43Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    0e2a7014-8078-4c40-91e3-aca60a98ac68
NVD CPE · OPERATING SYSTEMmicrosoftwindows_7Environmental constraint · 1 assertions
Version not applicableCanonical identity product-f20a05098a41a238f96b56b817d0482887bb39ad40620198bbe05da10ee02ffcLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 6
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    c2b1c231-de19-4b8f-a4aa-5b3a65276e46
NVD CPE · OPERATING SYSTEMmicrosoftwindows_8.1Environmental constraint · 1 assertions
Version not applicableCanonical identity product-7e46de82012029583622f69d79b86bc210b5bd25b8cb3bb4468936702b23c4b0Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:pro_n:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 7
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    854ebfba-2ed3-4158-bbd4-801cdec551ee
NVD CPE · OPERATING SYSTEMmicrosoftwindows_rt_8.1Environmental constraint · 1 assertions
Version not applicableCanonical identity product-076c7e47c78d9425d54dea0b063ed7cd79e5f9f0bfdb3c9153b8aec4e71a7ad9Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 8
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    c6ce5198-c498-4672-af4c-77ab4be06c5c
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2008Environmental constraint · 2 assertions
Version not applicable; Version r2Canonical identity product-217b1ab3d25f361a639824f86753d418b35aa2a816ee370bb71b5d1dd883d87aLinked exact
Scope constrained
Inspect raw assertions
  1. cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    5f422a8c-2c4e-42c8-b420-e0728037e15c
  2. cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 9
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    af07a81d-12e5-4b1d-bff9-c8d08c32ff4f
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2012Environmental constraint · 2 assertions
Version not applicable; Version r2Canonical identity product-5a80416e92fed0cddbb3d4f3840218b448dee11159824ad25a0353da566963feLinked exact
Scope constrained
Inspect raw assertions
  1. cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 10
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    db18c4ce-5917-401e-acf7-2747084fd36e
  2. cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    1 · node/1 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    a7df96f8-ba6a-4780-9ca3-f719b3f81074
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2016Environmental constraint · 1 assertions
Version not applicableCanonical identity product-02e254d111ce604757a15650ef469f4f8365d6247da82ce3ac2695c3cfc7dc5fLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 11
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    041ff8ba-0b12-4a1f-b4bf-9c4f33b7c1e7
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2019Environmental constraint · 1 assertions
Version not applicableCanonical identity product-25a2932c0bbcb648f7e391c8b9d34c734e5085444c03c1c206b9d4c4baa80b25Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 12
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    db79ee26-fc32-417d-a49c-a1a63165a968

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-d26e3505f2452daa926474c7ca23fc78f73a7b20902783174428ff8d6e276baa

Source class
Nvd cpe vulnerable target
Assertions
3
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
5000141e-7b42-4379-b10d-e7fb53a06f3474990739-d0d7-46ab-a2c0-8c159693a0379c0c6121-91ab-440e-a687-d9578f6ca440
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
3
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
2a712a06-64a2-4af3-a697-0d2bf35f932885b4bd7f-5ea4-41c2-856c-80b79a942177b9e055d1-b952-40ee-a417-0c0fe6e4557c

Assessments

CVSS by origin

7.5
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.6
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:H/Au:N/C:C/I:C/A:C
7.5
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5
CISA-ADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

7.5Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
7.5
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.