Evidence dossier
CVE-2020-1380
Scripting Engine Memory Corruption Vulnerability
Exploited in the wild (CISA KEV since Nov 3, 2021). microsoft reports CVSS 3.1 7.8. Severity assessments differ within at least one CVSS version. EPSS estimates 24.2% 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. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the IE rendering engine. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.
- State
- PUBLISHED
- Published
- Aug 17, 2020
- Updated
- Oct 21, 2025
- Evidence coverage
- 80%
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: Scripting Engine Memory Corruption Vulnerability
Inspect raw assertion
- Field
container- Value
- Scripting Engine Memory Corruption Vulnerability
- Source dateFirst observed by CASCACISA KEVOriginal evidence ↗
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 CASCAFIRST EPSSOriginal evidence ↗
EPSS score: 24.19% probability · 97.68th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.241880000000; percentile 0.976820000000
Assessments differ
Values are shown separately by source and CVSS version.
CISA KEV · catalog date Nov 3, 2021 · first observed Jul 19, 2026
FIRST EPSS · score date Aug 27, 2026 · 97.7th percentile · first observed Aug 27, 2026
microsoft · CVSS 3.1 · first observed Jul 19, 2026 · values shown separately below
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 assertions materially conflict and remain visible side by side.
- Revision
- casca-direct-cvss-eligibility-v1
- Cutoff
- Aug 27, 2026
- Resolution
- Resolve conflict
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
Scripting Engine Memory Corruption Vulnerability
Inspect raw assertion
- Field
container- Value
- Scripting Engine Memory Corruption Vulnerability
Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability
Inspect raw assertion
- Field
observed_exploitation- Value
- Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability
24.19% probability · 97.68th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.241880000000; percentile 0.976820000000
Applicability
Cited product scope
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 2026-07-21T06:45:29.809Z
27d65b0f-b718-4b4f-bb79-c47c68d09dfa - Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z
955dae73-7302-438b-aee1-058d7cc5d48e
17 scope groups
Canonical linkage remains open; the cited source assertion is retained below.
Inspect raw assertion
[{"status": "affected", "version": "1.0.0", "lessThan": "publication", "versionType": "custom"}]product-d26e3505f2452daa926474c7ca23fc78f73a7b20902783174428ff8d6e276baaLinked exactInspect raw assertion
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
d7809f78-8d56-4925-a8f9-4119b973a667
product-9851bd571b8ab08bca589cd73710badfef557d036f0fb7707f694f1c9f597cb4Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 0
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
542daeec-73cc-46c6-a630-bf474a3446ac
product-740fec3e9838b5eabe76ebe27e4d0d7a4cb2e0ef7e13923300d3d0b51e3fce1cLinked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 1
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
61019899-d7af-46e4-a72c-d189180f66ab
product-d059dbfcd39652adfca6d48669484008cb5d4a8b33116c81ee002cd9101904afLinked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 2
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
ac160b20-3ea0-49a0-a857-4e7a1c2d74e2
product-5e821ea3746af154a469c180e78b9f4d663edf21461517987eed76740c7910c1Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 3
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
00345596-e9e0-4096-8dc6-0212f4747a13
product-a3084138383423221f61594e86f5b295e5e254acd7ae5284f45e0877a084db43Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 4
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
2e332666-2e03-468e-bc30-299816d6e8ed
product-9868fa1c12254f9aff51c0302ecb2ea1ab1d9ca0547bde09677154b24f8c7c61Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 5
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
a363ce8f-f399-4b6e-9e7d-349792f95ddb
product-ef5324dcc791e4e872d6c2be0aefa1d7687ca82c3b4ac5d1f72c76cce8395218Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 6
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
a1b570a8-ed1a-46b6-b8ab-064445f8fc4c
product-9b245936275be71b526838fc72ea633d195b35bdd9dfc31bb6df51e7700edeccLinked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 7
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
d4dbe5b2-ae10-4251-bcda-dc5edee6ee67
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 8
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
c2b1c231-de19-4b8f-a4aa-5b3a65276e46
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 9
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
e93068db-549b-45ab-8e5c-00eb5d8b5cf8
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 10
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
c6ce5198-c498-4672-af4c-77ab4be06c5c
product-217b1ab3d25f361a639824f86753d418b35aa2a816ee370bb71b5d1dd883d87aLinked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 11
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
af07a81d-12e5-4b1d-bff9-c8d08c32ff4f
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 13
- 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
- 0 · node/1 · match 12
- 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 14
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
041ff8ba-0b12-4a1f-b4bf-9c4f33b7c1e7
product-25a2932c0bbcb648f7e391c8b9d34c734e5085444c03c1c206b9d4c4baa80b25Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 15
- 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
vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-d26e3505f2452daa926474c7ca23fc78f73a7b20902783174428ff8d6e276baa
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
68fe01eb-9177-4a79-b23b-2c32b0955964Canonical 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
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
98f00134-0797-4554-8706-fd6238cc7ad0Assessments
CVSS by origin
AV:N/AC:H/Au:N/C:C/I:C/A:CCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:CDirect CVE/CNA normalized decisions
microsoft
CVSS 3.1 · Primary · Original assertion · rank 1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C- Validation
- Valid match
- Recomputed
- 7.8
- 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.