CVE-2019-0657· NVD / CVE Program· CNA microsoft

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio Spoofing Vulnerability'.

MediumCVSS 5.9 · v3.0—No exploit Fix available

Pre-auth

Published: Mar 5, 2019
Updated: Jun 16, 2026
EPSS: 4.5% · 91th percentile
CWE: CWE-20

Follow this CVE

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 23 / 40 · 5.9 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 4.5%

Affected systems

Vendor	Product	CPE
microsoft	.net core	cpe:2.3:a:microsoft:.net_core
microsoft	powershell core	cpe:2.3:a:microsoft:powershell_core
microsoft	visual studio 2017	cpe:2.3:a:microsoft:visual_studio_2017
microsoft	.net framework	cpe:2.3:a:microsoft:.net_framework
microsoft	windows server 2008	cpe:2.3:o:microsoft:windows_server_2008
microsoft	windows 10	cpe:2.3:o:microsoft:windows_10
microsoft	windows 8.1	cpe:2.3:o:microsoft:windows_8.1
microsoft	windows server 2012	cpe:2.3:o:microsoft:windows_server_2012
microsoft	windows server 2016	cpe:2.3:o:microsoft:windows_server_2016
microsoft	windows server 2019	cpe:2.3:o:microsoft:windows_server_2019
microsoft	windows 7	cpe:2.3:o:microsoft:windows_7
microsoft	windows rt 8.1	cpe:2.3:o:microsoft:windows_rt_8.1

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

microsoft .net core1.0
microsoft .net core2.1
microsoft .net core2.2
microsoft .net framework2.0
microsoft .net framework3.0
microsoft .net framework3.5
microsoft .net framework3.5.1
microsoft .net framework4.5.2
microsoft .net framework4.6
microsoft .net framework4.6.1
microsoft .net framework4.6.2
microsoft .net framework4.7
microsoft .net framework4.7.1
microsoft .net framework4.7.2
microsoft powershell core6.0
microsoft powershell core6.1
microsoft visual studio 2017all versions
microsoft visual studio 201715.9

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

Microsoft .NET Core
- 1, 2.1, 2.2affected
Microsoft Microsoft .NET Framework 2.0
- Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2affected
Microsoft Microsoft .NET Framework 3.0
- Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2affected
Microsoft Microsoft .NET Framework 3.5
- Windows Server 2012, Windows Server 2012 (Server Core installation), Windows 8.1 for 32-bit systems, Windows 8.1 for x64-based systems, Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows 10 for 32-bit Systems, Windows 10 for x64-based Systems, Windows Server 2016, Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1703 for 32-bit Systems … (+13)affected
Microsoft Microsoft .NET Framework 3.5.1
- Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1affected
Microsoft Microsoft .NET Framework 4.5.2
- Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows 8.1 for 32-bit systems, Windows 8.1 for x64-based systems, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2012 R2 (Server Core installation), Windows Server 2008 for 32-bit Systems Service Pack 2 … (+1)affected
Microsoft Microsoft .NET Framework 4.6
- Windows Server 2008 for 32-bit Systems Service Pack 2, Windows Server 2008 for x64-based Systems Service Pack 2affected
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
- Windows Server 2016, Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 (Server Core installation)affected
Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2
- Windows 10 for 32-bit Systems, Windows 10 for x64-based Systemsaffected
Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2
- Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows 8.1 for 32-bit systems, Windows 8.1 for x64-based systems, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2012 R2 (Server Core installation)affected
Microsoft Microsoft .NET Framework 4.7.1/4.7.2
- Windows 10 Version 1709 for 32-bit Systems, Windows 10 Version 1709 for x64-based Systems, Windows Server, version 1709 (Server Core Installation), Windows 10 Version 1709 for ARM64-based Systemsaffected
Microsoft Microsoft .NET Framework 4.7.2
- Windows 10 Version 1803 for 32-bit Systems, Windows 10 Version 1803 for x64-based Systems, Windows Server, version 1803 (Server Core Installation), Windows 10 Version 1803 for ARM64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation)affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
NuGet	Microsoft.NETCore.App	from 2.1.0 · before 2.1.8	2.1.8
NuGet	Microsoft.NETCore.App	from 2.2.0 · before 2.2.2	2.2.2
NuGet	System.Private.Uri	from 4.3.0 · before 4.3.2	4.3.2
Red Hat:rhel_dotnet:1.0::el7	rh-dotnetcore10-dotnetcore	before 0:1.0.14-1.el7	0:1.0.14-1.el7
Red Hat:rhel_dotnet:1.0::el7	rh-dotnetcore10-dotnetcore-debuginfo	before 0:1.0.14-1.el7	0:1.0.14-1.el7
Red Hat:rhel_dotnet:1.1::el7	rh-dotnetcore11-dotnetcore	before 0:1.1.11-2.el7	0:1.1.11-2.el7
Red Hat:rhel_dotnet:1.1::el7	rh-dotnetcore11-dotnetcore-debuginfo	before 0:1.1.11-2.el7	0:1.1.11-2.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21	before 0:2.1-7.el7	0:2.1-7.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21-dotnet	before 0:2.1.504-1.el7	0:2.1.504-1.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21-dotnet-debuginfo	before 0:2.1.504-1.el7	0:2.1.504-1.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21-dotnet-host	before 0:2.1.8-1.el7	0:2.1.8-1.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21-dotnet-runtime-2.1	before 0:2.1.8-1.el7	0:2.1.8-1.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21-dotnet-sdk-2.1	before 0:2.1.504-1.el7	0:2.1.504-1.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21-dotnet-sdk-2.1.5xx	before 0:2.1.504-1.el7	0:2.1.504-1.el7
Red Hat:rhel_dotnet:2.1::el7	rh-dotnet21-runtime	before 0:2.1-7.el7	0:2.1-7.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22	before 0:2.2-3.el7	0:2.2-3.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-dotnet	before 0:2.2.104-2.el7	0:2.2.104-2.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-dotnet-debuginfo	before 0:2.2.104-2.el7	0:2.2.104-2.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-dotnet-host	before 0:2.2.2-2.el7	0:2.2.2-2.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-dotnet-host-fxr-2.2	before 0:2.2.2-2.el7	0:2.2.2-2.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-dotnet-runtime-2.2	before 0:2.2.2-2.el7	0:2.2.2-2.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-dotnet-sdk-2.2	before 0:2.2.104-2.el7	0:2.2.104-2.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-dotnet-sdk-2.2.1xx	before 0:2.2.104-2.el7	0:2.2.104-2.el7
Red Hat:rhel_dotnet:2.2::el7	rh-dotnet22-runtime	before 0:2.2-3.el7	0:2.2-3.el7

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

CVE-2020-1147A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check theKEV
89Now
CVE-2018-0764Microsoft .NET Framework 1.1, 2.0, 3.0, 3.5, 3.5.1, 4, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 5.7 and .NET Core 1.0.
33Monitor
CVE-2019-1301A denial of service vulnerability exists when .NET Core improperly handles web requests, aka '.NET Core Denial of Service Vulnerability'.
32Monitor
CVE-2019-0820A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings, aka '.NET Framework and .NET Co
32Monitor
CVE-2018-8409A denial of service vulnerability exists when System.IO.Pipelines improperly handles requests, aka "System.IO.Pipelines Denial of Service."
32Monitor
CVE-2018-0765A denial of service vulnerability exists when .NET and .NET Core improperly process XML documents, aka ".NET and .NET Core Denial of Service
32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
NuGet:Microsoft.NETCore.App	2.1.8	Package registry (OSV)
NuGet:Microsoft.NETCore.App	2.2.2	Package registry (OSV)
NuGet:System.Private.Uri	4.3.2	Package registry (OSV)
red hat:rh-dotnet21	0:2.1-7.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnet21-dotnet	0:2.1.504-1.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnet21-dotnet-debuginfo	0:2.1.504-1.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnet21-dotnet-host	0:2.1.8-1.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnet21-dotnet-runtime-2.1	0:2.1.8-1.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnet21-dotnet-sdk-2.1	0:2.1.504-1.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnet21-dotnet-sdk-2.1.5xx	0:2.1.504-1.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnet21-runtime	0:2.1-7.el7 · Red Hat:rhel_dotnet:2.1::el7	Package registry (OSV)
red hat:rh-dotnetcore10-dotnetcore	0:1.0.14-1.el7 · Red Hat:rhel_dotnet:1.0::el7	Package registry (OSV)
red hat:rh-dotnetcore10-dotnetcore-debuginfo	0:1.0.14-1.el7 · Red Hat:rhel_dotnet:1.0::el7	Package registry (OSV)
red hat:rh-dotnetcore11-dotnetcore	0:1.1.11-2.el7 · Red Hat:rhel_dotnet:1.1::el7	Package registry (OSV)
red hat:rh-dotnetcore11-dotnetcore-debuginfo	0:1.1.11-2.el7 · Red Hat:rhel_dotnet:1.1::el7	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: none
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

Fix✗ → ✓Sep 28, 2026, 10:47 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records