CISA KEV · catalog date Mar 3, 2022 · first observed Jul 19, 2026
Evidence dossier
CVE-2017-8540
The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1,…
Exploited in the wild (CISA KEV since Mar 3, 2022). NVD reports CVSS 3.1 7.8. EPSS estimates 72.0% exploit likelihood as of Aug 27, 2026.
As of Aug 27, 2026
Normalized restatement
The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability", a different vulnerability than CVE-2017-8538 and CVE-2017-8541.
- State
- PUBLISHED
- Published
- May 26, 2017
- Updated
- Oct 21, 2025
- Evidence coverage
- 98%
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: The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability", a different vulnerability than CVE-2017-8538 and CVE-2017-8541.
Inspect raw assertion
- Field
container- Value
- The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability", a different vulnerability than CVE-2017-8538 and CVE-2017-8541.
- Source dateFirst observed by CASCACISA KEVOriginal evidence ↗
Exploitation cataloged: Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
Inspect raw assertion
- Field
observed_exploitation- Value
- Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
- Source dateFirst observed by CASCAFIRST EPSSOriginal evidence ↗
EPSS score: 71.96% probability · 99.38th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.719610000000; percentile 0.993790000000
FIRST EPSS · score date Aug 27, 2026 · 99.4th 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
The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability", a different vulnerability than CVE-2017-8538 and CVE-2017-8541.
Inspect raw assertion
- Field
container- Value
- The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability", a different vulnerability than CVE-2017-8538 and CVE-2017-8541.
Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
Inspect raw assertion
- Field
observed_exploitation- Value
- Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
71.96% probability · 99.38th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.719610000000; percentile 0.993790000000
Applicability
Cited product scope
Grouped from 3 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
20 scope groups
Canonical linkage remains open; the cited source assertion is retained below.
Inspect raw assertion
[{"status": "affected", "version": "Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016."}]product-ce53386f54bc2808f87deeecd6d0b2bd4bb134300bb3450ada130779325ed761Linked exactInspect raw assertion
cpe:2.3:a:microsoft:endpoint_protection:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 0
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
ac297f51-9742-43a2-8783-53b7e4d5e435
product-d87daca995d075bf30565cc429e7242a47683272975068df1d327ec1d8ff609cLinked exactInspect raw assertions
cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 2
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
8039fba1-73d4-4ff2-b183-0dcc961cbff7
cpe:2.3:a:microsoft:exchange_server:2013:-:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 1
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
27ef8db7-d5a0-47a8-9f69-7d0259490d69
product-108675de1bd9465759a642a35b6cf047ca806e5f1732d596b4ca4f824367772cLinked exactInspect raw assertions
cpe:2.3:a:microsoft:forefront_endpoint_protection:2010:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 4
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
e55e0ddf-4d05-4e5f-bc54-790a722e87a5
cpe:2.3:a:microsoft:forefront_endpoint_protection:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 3
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
cc9503e8-6282-4f3a-a6da-0fa8a9bd941b
product-70a7c037351482df947609e0ebffd09f094aa43f054b6e4b7437ae1c5675f71fLinked exactInspect raw assertion
cpe:2.3:a:microsoft:forefront_security:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 5
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
bb6f1182-ac87-4a8e-841d-25c94dd7116a
product-e019481958a9bba74d94c0b8b7907bfe2e9b63bb243f9f15016b8c1e9887784aLinked exactInspect raw assertion
cpe:2.3:a:microsoft:intune_endpoint_protection:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 6
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
cfc8e84f-eec0-4803-9779-8a49658f2180
product-315dd096f797361cd02afd2ef1d9e27d524777b10b987da6deca95d0a8db8e53Linked exactInspect raw assertion
cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 0
- Logic
- OR
- Version bounds
- from including 1.1.13701.0; through excluding 1.1.13704.0
- Match ID
232a1dc9-d943-407f-b82c-3d7522e19a18
product-00176eed9114b0b49dba93db6421f6c54cf58fda4df193fdcea9ac0b5c28bcd0Linked exactInspect raw assertion
cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 7
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
20fba682-b703-4590-98e4-8897eed11de0
product-4a7e8133290ab8e5810e9f7e059dc2e319534f43216cc139adf3e88079f0a546Linked exactInspect raw assertion
cpe:2.3:a:microsoft:system_center_endpoint_protection:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 8
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
194de421-9536-4001-9a27-6c88805421ea
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-7b807aecec9e7ce1999b1cdf357022e504d2f3daa554142c46b57e2c37e3597aLinked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1511:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 1
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
7a8e9d99-bd78-4340-88f2-5aff27ac37c9
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 2
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
61019899-d7af-46e4-a72c-d189180f66ab
product-2f3550a8fd2528ab6e756c5ea638f5f3dc368adee47ca6f01d64918c0b9eb2a5Linked exactInspect raw assertion
cpe:2.3:o:microsoft:windows_10_1703:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 3
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
e1dd582c-1660-4e6e-81a1-537bd1307a99
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 4
- 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 5
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
e93068db-549b-45ab-8e5c-00eb5d8b5cf8
product-d1bb1b077722d3bbad785cb5d7ba6b0706fa0f338b6d90290bbf3bbc29c52a49Linked exactInspect raw assertion
cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 9
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
794244d1-f317-44c8-8338-3da74e71d4b0
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 6
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
c6ce5198-c498-4672-af4c-77ab4be06c5c
product-217b1ab3d25f361a639824f86753d418b35aa2a816ee370bb71b5d1dd883d87aLinked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 8
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
2aca9287-b475-4af7-a4da-a7143cef9e57
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 7
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
5f422a8c-2c4e-42c8-b420-e0728037e15c
product-5a80416e92fed0cddbb3d4f3840218b448dee11159824ad25a0353da566963feLinked exactInspect raw assertions
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 9
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
a7df96f8-ba6a-4780-9ca3-f719b3f81074
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 0 · node/1 · match 10
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
db18c4ce-5917-401e-acf7-2747084fd36e
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 11
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
041ff8ba-0b12-4a1f-b4bf-9c4f33b7c1e7
Affected-product evidence
Accepted scope and product mapping
9 canonical links · 1 source-reported links
vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-00176eed9114b0b49dba93db6421f6c54cf58fda4df193fdcea9ac0b5c28bcd0
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
bdee7054-b443-4f9f-ac6d-b38b1aa81af9vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-108675de1bd9465759a642a35b6cf047ca806e5f1732d596b4ca4f824367772c
- Source class
- Nvd cpe vulnerable target
- Assertions
- 2
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
099ef2f4-d193-4d2a-b71d-6f0c5b2dfaf04a94cc80-1a40-4157-be4f-e74621aded4evendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-315dd096f797361cd02afd2ef1d9e27d524777b10b987da6deca95d0a8db8e53
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
0260c8fe-ac42-402e-91b5-c7364c27c01bvendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-4a7e8133290ab8e5810e9f7e059dc2e319534f43216cc139adf3e88079f0a546
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
b0808fa4-444d-4afc-8c77-32207c0f0855vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-70a7c037351482df947609e0ebffd09f094aa43f054b6e4b7437ae1c5675f71f
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
55289ad5-b135-48a7-a018-407cd60dececvendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-ce53386f54bc2808f87deeecd6d0b2bd4bb134300bb3450ada130779325ed761
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
dcdfda59-559e-4029-8bee-68313552bc83vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-d1bb1b077722d3bbad785cb5d7ba6b0706fa0f338b6d90290bbf3bbc29c52a49
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
a3c34c0d-d693-42fd-9fd2-d852978a3d12vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-d87daca995d075bf30565cc429e7242a47683272975068df1d327ec1d8ff609c
- Source class
- Nvd cpe vulnerable target
- Assertions
- 2
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
730f6d2d-17c7-4b2e-b9f1-62361c46f17eada94347-fd6b-4342-81c2-1665fd2aab9cvendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-e019481958a9bba74d94c0b8b7907bfe2e9b63bb243f9f15016b8c1e9887784a
- Source class
- Nvd cpe vulnerable target
- Assertions
- 1
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
ec94f914-567d-4e2b-9539-b36a234ea831Canonical 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
96bfdc56-a23b-4e28-bd2e-e1f8c88977f5Assessments
CVSS by origin
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HAV:N/AC:M/Au:N/C:C/I:C/A:CCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS:3.1/AV:L/AC:L/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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- 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.