CISA KEV · catalog date Mar 25, 2022 · first observed Jul 19, 2026
Evidence dossier
CVE-2018-8373
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 Mar 25, 2022). NVD reports CVSS 3.1 7.5. EPSS estimates 61.9% exploit likelihood as of Aug 27, 2026.
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-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.
- State
- PUBLISHED
- Published
- Aug 15, 2018
- Updated
- Oct 21, 2025
- Evidence coverage
- 92%
Evidence chronology
What was known when
- Source dateSource date omittedFirst observed by CASCACISA-ADPOriginal evidence ↗
Record text: CISA ADP Vulnrichment
Inspect raw assertion
- Field
container- Value
- CISA ADP Vulnrichment
- Source dateSource date omittedFirst observed by CASCACVE ProgramOriginal evidence ↗
Record text: CVE Program Container
Inspect raw assertion
- Field
container- Value
- CVE Program Container
- Source dateSource date omittedFirst observed by CASCAmicrosoftOriginal evidence ↗
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-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.
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-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.
- Source dateFirst observed by CASCACISA KEVOriginal evidence ↗
Exploitation cataloged: Microsoft Scripting Engine Memory Corruption Vulnerability
Inspect raw assertion
- Field
observed_exploitation- Value
- Microsoft Scripting Engine Memory Corruption Vulnerability
- Source dateFirst observed by CASCAFIRST EPSSOriginal evidence ↗
EPSS score: 61.91% probability · 99.11th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.619120000000; percentile 0.991090000000
FIRST EPSS · score date Aug 27, 2026 · 99.1th percentile · first observed Aug 27, 2026
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-v1Eligible evidence is present for this bounded claim.
- Revision
- evidence-policy-v1.1.0
- Cutoff
- Aug 27, 2026
- Resolution
- None
Eligible evidence is present for this bounded claim.
- Revision
- evidence-policy-v1.1.0
- Cutoff
- Aug 27, 2026
- Resolution
- None
Eligible evidence is present for this bounded claim.
- Revision
- casca-direct-cvss-eligibility-v1
- Cutoff
- Aug 27, 2026
- Resolution
- None
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 ADP Vulnrichment
Inspect raw assertion
- Field
container- Value
- CISA ADP Vulnrichment
CVE Program Container
Inspect raw assertion
- Field
container- Value
- CVE Program Container
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-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.
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-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.
Microsoft Scripting Engine Memory Corruption Vulnerability
Inspect raw assertion
- Field
observed_exploitation- Value
- Microsoft Scripting Engine Memory Corruption Vulnerability
61.91% probability · 99.11th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.619120000000; percentile 0.991090000000
Applicability
Cited product scope
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 2026-07-21T06:45:29.809Z
27d65b0f-b718-4b4f-bb79-c47c68d09dfa - Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z
955dae73-7302-438b-aee1-058d7cc5d48e
15 scope groups
Canonical linkage remains open; the cited source assertion is retained below.
Inspect raw assertion
[{"status": "affected", "version": "Windows Server 2012"}]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 x64-based Systems"}, {"status": "affected", "version": "Windows 10 Version 1803 for 32-bit Systems"}, {"status": "affected", "version": "Windows 10 Version 1803 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"}]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"}]product-d26e3505f2452daa926474c7ca23fc78f73a7b20902783174428ff8d6e276baaLinked exactInspect raw assertions
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
cpe:2.3:a:microsoft:internet_explorer:11:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 0
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
15baaa8c-7af1-46ce-9ffb-3a498508a1bf
cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 2 · node/0 · match 0
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
c043eddd-41bf-4718-bdcf-158bbbdb6360
product-9851bd571b8ab08bca589cd73710badfef557d036f0fb7707f694f1c9f597cb4Linked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:x64:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 0
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
a045ac0a-471e-444c-b3b0-4cabc23e8cfb
cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:x86:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 1
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
28a7fee9-b473-48a0-b0ed-a5cc1e44194c
product-740fec3e9838b5eabe76ebe27e4d0d7a4cb2e0ef7e13923300d3d0b51e3fce1cLinked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 2
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
5e491e46-1917-41fe-8f9a-bb0bddeb42c3
cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 3
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
0a1bc97a-263e-4291-8aef-02ee4e6031e9
product-2f3550a8fd2528ab6e756c5ea638f5f3dc368adee47ca6f01d64918c0b9eb2a5Linked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_10_1703:-:*:*:*:*:*:x64:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 4
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
b98db3ff-cc3b-4e9f-a9cc-ec4c89af3b31
cpe:2.3:o:microsoft:windows_10_1703:-:*:*:*:*:*:x86:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 5
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
8733bf37-7bf2-409d-9452-da8a92da1124
product-d059dbfcd39652adfca6d48669484008cb5d4a8b33116c81ee002cd9101904afLinked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:x64:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 6
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
469f95d3-abbb-4f1a-a000-be0f6bd60ff6
cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:x86:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 7
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
d76003fb-ee99-4d8e-b6a0-b13c2041e5a0
product-5e821ea3746af154a469c180e78b9f4d663edf21461517987eed76740c7910c1Linked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:x86:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 9
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
c1cfb53b-b17b-47bd-bac1-c6c5d168ffb6
cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:x64:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 8
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
d82f8af7-ed01-4649-849e-f248f0e02384
product-f20a05098a41a238f96b56b817d0482887bb39ad40620198bbe05da10ee02ffcLinked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 10
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
7519928d-0ff2-4584-8058-4c7764cd5671
product-7e46de82012029583622f69d79b86bc210b5bd25b8cb3bb4468936702b23c4b0Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_8.1:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 11
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
a7f51b5f-aa19-4d31-89fa-6dfac4ba8f0f
product-076c7e47c78d9425d54dea0b063ed7cd79e5f9f0bfdb3c9153b8aec4e71a7ad9Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_rt_8.1:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 12
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
197e82cb-81af-40f1-a55c-7b596891a783
product-217b1ab3d25f361a639824f86753d418b35aa2a816ee370bb71b5d1dd883d87aLinked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 2 · node/1 · match 0
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
5f422a8c-2c4e-42c8-b420-e0728037e15c
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 13
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
2aca9287-b475-4af7-a4da-a7143cef9e57
product-5a80416e92fed0cddbb3d4f3840218b448dee11159824ad25a0353da566963feLinked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 14
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
db18c4ce-5917-401e-acf7-2747084fd36e
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
product-02e254d111ce604757a15650ef469f4f8365d6247da82ce3ac2695c3cfc7dc5fLinked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 15
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
041ff8ba-0b12-4a1f-b4bf-9c4f33b7c1e7
Affected-product evidence
Accepted scope and product mapping
1 canonical links · 1 source-reported links
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
46f8d543-cb4e-4d90-af9c-0b595479f7a74e7367b8-e0eb-4183-8ca0-ed86049112729ac62880-cdd5-453f-a375-4c65aed807cbCanonical 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
161c9843-9bb8-4868-bb48-fec6d26184a75a59b9a3-2729-4efa-9131-b4579a6507aafdbdd7f7-c95e-4871-9909-98829a187f5cAssessments
CVSS by origin
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HAV:N/AC:H/Au:N/C:C/I:C/A:CCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HDirect CVE/CNA normalized decisions
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.