CVE-2018-8517 — A denial of service vulnerability exists when .NET Framework improperly handles special web requests, aka ".NET Framework Denial Of Service Vulnerability." This affects Microsoft .NET Framework 4.6, Microsoft .NET Framework 3.5, Microsoft .NET Framework 4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 4.7.2

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HIGH

A denial of service vulnerability exists when .NET Framework improperly handles special web requests, aka ".NET Framework Denial Of Service Vulnerability." This affects Microsoft .NET Framework 4.6, Microsoft .NET Framework 3.5, Microsoft .NET Framework 4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 4.7.2

Published Dec 12, 2018

7.5

HIGH

CVSS 3.0

EPSS 5.67%

Description

A denial of service vulnerability exists when .NET Framework improperly handles special web requests, aka ".NET Framework Denial Of Service Vulnerability." This affects Microsoft .NET Framework 4.6, Microsoft .NET Framework 3.5, Microsoft .NET Framework 4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 4.7.2.

Affected products

Vendor Microsoft Product Microsoft .NET Framework Default
n/a
- Version
  3.5 on Windows 10 Version 1607 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1607 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1703 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1703 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1709 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1709 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1803 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1803 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1809 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 10 Version 1809 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 8.1 for 32-bit systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows 8.1 for x64-based systems
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2012
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2012 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2012 R2
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2012 R2 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2016
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2016 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2019
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server 2019 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server, version 1709 (Server Core Installation)
  Status
  affected
  Constraints
  -
- Version
  3.5 on Windows Server, version 1803 (Server Core Installation)
  Status
  affected
  Constraints
  -
- Version
  3.5.1 on Windows 7 for 32-bit Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  3.5.1 on Windows 7 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  3.5.1 on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows 7 for 32-bit Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows 7 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows 8.1 for 32-bit systems
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows 8.1 for x64-based systems
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows RT 8.1
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2008 for 32-bit Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2008 for x64-based Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2012
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2012 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2012 R2
  Status
  affected
  Constraints
  -
- Version
  4.5.2 on Windows Server 2012 R2 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  4.6 on Windows Server 2008 for x64-based Systems Service Pack 2
  Status
  affected
  Constraints
  -
- Version
  4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
  Status
  affected
  Constraints
  -
- Version
  4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 7 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 8.1 for x64-based systems
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows RT 8.1
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012 R2
  Status
  affected
  Constraints
  -
- Version
  4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  4.7.1/4.7.2 on Windows 10 Version 1709 for ARM64-based Systems
  Status
  affected
  Constraints
  -
- Version
  4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  4.7.1/4.7.2 on Windows Server, version 1709 (Server Core Installation)
  Status
  affected
  Constraints
  -
- Version
  4.7.2 on Windows 10 Version 1803 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  4.7.2 on Windows 10 Version 1803 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  4.7.2 on Windows 10 Version 1809 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  4.7.2 on Windows 10 Version 1809 for x64-based Systems
  Status
  affected
  Constraints
  -
- Version
  4.7.2 on Windows Server 2019
  Status
  affected
  Constraints
  -
- Version
  4.7.2 on Windows Server 2019 (Server Core installation)
  Status
  affected
  Constraints
  -
- Version
  4.7.2 on Windows Server, version 1803 (Server Core Installation)
  Status
  affected
  Constraints
  -
- Version
  4.7/4.7.1/4.7.2 on Windows 10 Version 1703 for 32-bit Systems
  Status
  affected
  Constraints
  -
- Version
  4.7/4.7.1/4.7.2 on Windows 10 Version 1703 for x64-based Systems
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Microsoft

Microsoft .NET Framework

n/a

Version	Status	Constraints
3.5 on Windows 10 Version 1607 for 32-bit Systems	affected	-
3.5 on Windows 10 Version 1607 for x64-based Systems	affected	-
3.5 on Windows 10 Version 1703 for 32-bit Systems	affected	-
3.5 on Windows 10 Version 1703 for x64-based Systems	affected	-
3.5 on Windows 10 Version 1709 for 32-bit Systems	affected	-
3.5 on Windows 10 Version 1709 for x64-based Systems	affected	-
3.5 on Windows 10 Version 1803 for 32-bit Systems	affected	-
3.5 on Windows 10 Version 1803 for x64-based Systems	affected	-
3.5 on Windows 10 Version 1809 for 32-bit Systems	affected	-
3.5 on Windows 10 Version 1809 for x64-based Systems	affected	-
3.5 on Windows 8.1 for 32-bit systems	affected	-
3.5 on Windows 8.1 for x64-based systems	affected	-
3.5 on Windows Server 2012	affected	-
3.5 on Windows Server 2012 (Server Core installation)	affected	-
3.5 on Windows Server 2012 R2	affected	-
3.5 on Windows Server 2012 R2 (Server Core installation)	affected	-
3.5 on Windows Server 2016	affected	-
3.5 on Windows Server 2016 (Server Core installation)	affected	-
3.5 on Windows Server 2019	affected	-
3.5 on Windows Server 2019 (Server Core installation)	affected	-
3.5 on Windows Server, version 1709 (Server Core Installation)	affected	-
3.5 on Windows Server, version 1803 (Server Core Installation)	affected	-
3.5.1 on Windows 7 for 32-bit Systems Service Pack 1	affected	-
3.5.1 on Windows 7 for x64-based Systems Service Pack 1	affected	-
3.5.1 on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1	affected	-
3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1	affected	-
3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	affected	-
4.5.2 on Windows 7 for 32-bit Systems Service Pack 1	affected	-
4.5.2 on Windows 7 for x64-based Systems Service Pack 1	affected	-
4.5.2 on Windows 8.1 for 32-bit systems	affected	-
4.5.2 on Windows 8.1 for x64-based systems	affected	-
4.5.2 on Windows RT 8.1	affected	-
4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1	affected	-
4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	affected	-
4.5.2 on Windows Server 2008 for 32-bit Systems Service Pack 2	affected	-
4.5.2 on Windows Server 2008 for x64-based Systems Service Pack 2	affected	-
4.5.2 on Windows Server 2012	affected	-
4.5.2 on Windows Server 2012 (Server Core installation)	affected	-
4.5.2 on Windows Server 2012 R2	affected	-
4.5.2 on Windows Server 2012 R2 (Server Core installation)	affected	-
4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2	affected	-
4.6 on Windows Server 2008 for x64-based Systems Service Pack 2	affected	-
4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems	affected	-
4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems	affected	-
4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016	affected	-
4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 7 for x64-based Systems Service Pack 1	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows 8.1 for x64-based systems	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows RT 8.1	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012 R2	affected	-
4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)	affected	-
4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems	affected	-
4.7.1/4.7.2 on Windows 10 Version 1709 for ARM64-based Systems	affected	-
4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems	affected	-
4.7.1/4.7.2 on Windows Server, version 1709 (Server Core Installation)	affected	-
4.7.2 on Windows 10 Version 1803 for 32-bit Systems	affected	-
4.7.2 on Windows 10 Version 1803 for x64-based Systems	affected	-
4.7.2 on Windows 10 Version 1809 for 32-bit Systems	affected	-
4.7.2 on Windows 10 Version 1809 for x64-based Systems	affected	-
4.7.2 on Windows Server 2019	affected	-
4.7.2 on Windows Server 2019 (Server Core installation)	affected	-
4.7.2 on Windows Server, version 1803 (Server Core Installation)	affected	-
4.7/4.7.1/4.7.2 on Windows 10 Version 1703 for 32-bit Systems	affected	-
4.7/4.7.1/4.7.2 on Windows 10 Version 1703 for x64-based Systems	affected	-

Remediation

No remediation recorded yet.

Metrics

5.67% 0.05674

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.05674

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (22 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	5.67% (0.05674)	92.75th	v5 (v2026.06.15)
Jun 15, 2026	5.83% (0.05830)	92.17th	v5 (v2026.06.15)
May 30, 2026	13.98% (0.13980)	94.45th	v4 (v2025.03.14)
May 2, 2026	17.87% (0.17873)	95.16th	v4 (v2025.03.14)
Dec 6, 2025	13.98% (0.13980)	94.06th	v4 (v2025.03.14)
May 26, 2025	8.25% (0.08247)	91.77th	v4 (v2025.03.14)
Mar 30, 2025	7.18% (0.07177)	90.72th	v4 (v2025.03.14)
Mar 29, 2025	16.07% (0.16068)	91.36th	v4 (v2025.03.14)
Mar 17, 2025	7.33% (0.07331)	91.03th	v4 (v2025.03.14)
Dec 12, 2024	0.10% (0.00103)	43.60th	v3 (v2023.03.01)
May 4, 2024	0.10% (0.00104)	42.25th	v3 (v2023.03.01)
Mar 7, 2023	0.13% (0.00126)	45.52th	v3 (v2023.03.01)
Mar 6, 2023	5.20% (0.05203)	89.68th	v2 (v2022.01.01)
Oct 24, 2022	5.20% (0.05203)	89.33th	v2 (v2022.01.01)
Sep 17, 2022	4.43% (0.04434)	87.77th	v2 (v2022.01.01)
Jun 7, 2022	4.03% (0.04026)	84.83th	v2 (v2022.01.01)
Apr 1, 2022	3.36% (0.03358)	82.80th	v2 (v2022.01.01)
Feb 4, 2022	3.36% (0.03358)	65.90th	v2 (v2022.01.01)
Feb 3, 2022	8.69% (0.08690)	85.95th	v1
Jan 6, 2022	8.69% (0.08690)	85.79th	v1
Sep 1, 2021	8.69% (0.08690)	93.13th	v1
Apr 14, 2021	8.69% (0.08690)	0.00th	v1

Weaknesses (0)

No CWE recorded.

References (2)

http://www.securityfocus.com/bid/106075
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8517
x_refsource_CONFIRMPatchVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/106075		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8517		x_refsource_CONFIRMPatchVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner microsoft

Published Dec 12, 2018

Updated Aug 5, 2024

Reserved Mar 14, 2018

Link CVE-2018-8517

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-8517

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-8517